MaaS not able to deploy nodes.

[Prakash Nair]

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Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===============================-==============================-============-=================================================
ii maas 2.1.3+bzr5573-0ubuntu1~16.04.1 all "Metal as a Service" is a physical cloud and IPAM
ii maas-cli 2.1.3+bzr5573-0ubuntu1~16.04.1 all MAAS client and command-line interface
un maas-cluster-controller <none> <none> (no description available)
ii maas-common 2.1.3+bzr5573-0ubuntu1~16.04.1 all MAAS server common files
ii maas-dhcp 2.1.3+bzr5573-0ubuntu1~16.04.1 all MAAS DHCP server
ii maas-dns 2.1.3+bzr5573-0ubuntu1~16.04.1 all MAAS DNS server
ii maas-proxy 2.1.3+bzr5573-0ubuntu1~16.04.1 all MAAS Caching Proxy
ii maas-rack-controller 2.1.3+bzr5573-0ubuntu1~16.04.1 all Rack Controller for MAAS
ii maas-region-api 2.1.3+bzr5573-0ubuntu1~16.04.1 all Region controller API service for MAAS
ii maas-region-controller 2.1.3+bzr5573-0ubuntu1~16.04.1 all Region Controller for MAAS
un maas-region-controller-min <none> <none> (no description available)
un python-django-maas <none> <none> (no description available)
un python-maas-client <none> <none> (no description available)
un python-maas-provisioningserver <none> <none> (no description available)
ii python3-django-maas 2.1.3+bzr5573-0ubuntu1~16.04.1 all MAAS server Django web framework (Python 3)
ii python3-maas-client 2.1.3+bzr5573-0ubuntu1~16.04.1 all MAAS python API client (Python 3)
ii python3-maas-provisioningserver 2.1.3+bzr5573-0ubuntu1~16.04.1 all MAAS server provisioning libraries (Python 3)

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MAAS Version 2.1.3+bzr5573-0ubuntu1 (16.04.1) installed on a bare metal system.
Nodes are commissioned but deployment fails after 40 min.

Hardware SuperMicro system - X9DRFF-iG+/-7G+/-iTG+/-7TG+ (To be filled by O.E.M.)
Trying to deploy - Xenial (ga-16.04)

[Andres Rodriguez (andreserl)]

Looking at your log here:

2017-05-22 13:56:40 maasserver: [error] ################################ Exception: mapping values are not allowed here
  in "<unicode string>", line 13, column 7:
      maas: [wget, '--no-proxy', "http://1 ...
          ^ ################################
2017-05-22 13:56:40 maasserver: [error] Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/django/core/handlers/base.py", line 132, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python3/dist-packages/maasserver/utils/views.py", line 177, in view_atomic_with_post_commit_savepoint
    return view_atomic(*args, **kwargs)
  File "/usr/lib/python3.5/contextlib.py", line 30, in inner
    return func(*args, **kwds)
  File "/usr/lib/python3/dist-packages/maasserver/api/support.py", line 59, in __call__
    response = upcall(request, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/django/views/decorators/vary.py", line 21, in inner_func
    response = func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/piston3/resource.py", line 190, in __call__
    result = self.error_handler(e, request, meth, em_format)
  File "/usr/lib/python3/dist-packages/piston3/resource.py", line 188, in __call__
    result = meth(request, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/maasserver/api/support.py", line 298, in dispatch
    return function(self, request, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/metadataserver/api.py", line 726, in read
    user_data = get_curtin_userdata(node)
  File "/usr/lib/python3/dist-packages/maasserver/preseed.py", line 346, in get_curtin_userdata
    configs=get_curtin_yaml_config(node),
  File "/usr/lib/python3/dist-packages/maasserver/preseed.py", line 293, in get_curtin_yaml_config
    main_config = get_curtin_config(node)
  File "/usr/lib/python3/dist-packages/maasserver/preseed.py", line 434, in get_curtin_config
    config = yaml.load(template.substitute(**context))
  File "/usr/lib/python3/dist-packages/yaml/__init__.py", line 72, in load
    return loader.get_single_data()
  File "/usr/lib/python3/dist-packages/yaml/constructor.py", line 35, in get_single_data
    node = self.get_single_node()
  File "/usr/lib/python3/dist-packages/yaml/composer.py", line 36, in get_single_node
    document = self.compose_document()
  File "/usr/lib/python3/dist-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
  File "/usr/lib/python3/dist-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/usr/lib/python3/dist-packages/yaml/composer.py", line 127, in compose_mapping_node
    while not self.check_event(MappingEndEvent):
  File "/usr/lib/python3/dist-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/usr/lib/python3/dist-packages/yaml/parser.py", line 428, in parse_block_mapping_key
    if self.check_token(KeyToken):
  File "/usr/lib/python3/dist-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/usr/lib/python3/dist-packages/yaml/scanner.py", line 220, in fet...