if cloud-init status is not done, set_installer_password will crash

[Dan Bungert]

subiquity/server/server.py will only assign to cloud if 'status:done'
later, if we're not in dry run, set_installer_password will attempt to use self.cloud.

traceback

2021-05-20 14:39:07,854 INFO subiquity:101 Starting Subiquity server revision unknown
2021-05-20 14:39:07,854 INFO subiquity:102 Arguments passed: ['/home/marcustomlinson/Projects/flutter/ubuntu-desktop-installer/packages/subiquity_client/subiquity/subiquity/cmd/server.py']
2021-05-20 14:39:07,854 DEBUG asyncio:59 Using selector: EpollSelector
2021-05-20 14:39:07,855 DEBUG subiquitycore.prober:35 Prober() init finished, data:None
2021-05-20 14:39:07,857 DEBUG curtin:87 Running command ['dpkg', '--print-architecture'] with allowed return codes [0] (capture=True)
2021-05-20 14:39:07,866 DEBUG subiquitycore.utils:74 arun_command called: ['cloud-init', 'status', '--wait']
2021-05-20 14:39:08,220 DEBUG subiquitycore.utils:83 arun_command ['cloud-init', 'status', '--wait'] exited with code 0
2021-05-20 14:39:08,220 DEBUG subiquity.server.server:422 waited 0.35422635078430176s for cloud-init
2021-05-20 14:39:08,220 DEBUG subiquity.server.server:440 cloud-init status: '\nstatus: disabled\n', assumed disabled
2021-05-20 14:39:08,221 ERROR subiquity.server.server:324 top level error
Traceback (most recent call last):
  File "/home/marcustomlinson/Projects/flutter/ubuntu-desktop-installer/packages/subiquity_client/subiquity/subiquity/server/server.py", line 504, in start
    self.set_installer_password()
  File "/home/marcustomlinson/Projects/flutter/ubuntu-desktop-installer/packages/subiquity_client/subiquity/subiquity/server/server.py", line 474, in set_installer_password
    self.cloud.cfg, self.cloud.distro)
AttributeError: 'SubiquityServer' object has no attribute 'cloud'
2021-05-20 14:39:08,221 ERROR subiquity.server.server:324 top level error
Traceback (most recent call last):
  File "/home/marcustomlinson/Projects/flutter/ubuntu-desktop-installer/packages/subiquity_client/subiquity/subiquity/server/server.py", line 308, in _run_error_cmds
    await report._info_task
AttributeError: 'NoneType' object has no attribute '_info_task'

[Michael Hudson-Doyle (mwhudson)]

Oops.