'Invalid literal' error occurs when a hostname in an endpoint has a version string

[Takashi Natsume]

'Invalid literal' error occurs when an endpoint does not have a path string and
a hostname in an endpoint has a version string('v\d+\.?\d*').

For example, 'http://v1.test:9292/'.

[How to reproduce]
stack@devstack-kilo:/opt/devstack$ export OS_IMAGE_URL=http://localhost:9292/
stack@devstack-kilo:/opt/devstack$ glance image-list
+--------------------------------------+---------------------------------+
| ID | Name |
+--------------------------------------+---------------------------------+
| f543a518-ffca-4e7d-ac41-e64802e74ad5 | cirros-0.3.2-x86_64-uec |
| 9ea58a20-7c1c-4769-8007-ea1c5f000ea5 | cirros-0.3.2-x86_64-uec-kernel |
| 439c10b8-ed74-44df-9e85-8b3b62c2c7c7 | cirros-0.3.2-x86_64-uec-ramdisk |
+--------------------------------------+---------------------------------+
stack@devstack-kilo:/opt/devstack$ export OS_IMAGE_URL=http://v1.test:9292/
stack@devstack-kilo:/opt/devstack$ ping -c 5 v1.test
PING localhost (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.088 ms
64 bytes from localhost (127.0.0.1): icmp_seq=2 ttl=64 time=0.036 ms
64 bytes from localhost (127.0.0.1): icmp_seq=3 ttl=64 time=0.051 ms
64 bytes from localhost (127.0.0.1): icmp_seq=4 ttl=64 time=0.051 ms
64 bytes from localhost (127.0.0.1): icmp_seq=5 ttl=64 time=0.067 ms

--- localhost ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3999ms
rtt min/avg/max/mdev = 0.036/0.058/0.088/0.019 ms
stack@devstack-kilo:/opt/devstack$ glance image-list
WARNING: The client is falling back to v1 because the accessing to v2 failed. This behavior will be removed in future versions
invalid literal for float(): 1.test:9292

[Environment]
python-glanceclient: master(commit: 54ae632f1b6dfba18a16ba934cd8052fe766693f)
glance: stable/kilo(2015.1.0)
OS: Ubuntu 14.04 LTS

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/218126

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/218126
Committed: https://git.openstack.org/cgit/openstack/python-glanceclient/commit/?id=19480df10a98165597d33eea360cbfe7460e3309
Submitter: Jenkins
Branch: master

commit 19480df10a98165597d33eea360cbfe7460e3309
Author: Takashi NATSUME <email address hidden>
Date: Fri Aug 28 16:16:06 2015 +0900

    Add parsing the endpoint URL

    Add parsing the endpoint URL and check the path string only
    in order to decide the API version.

    Change-Id: Ib0a035f3bed31e2162a1231a5f5dcc3907d37243
    Closes-Bug: #1489727