Check that the number of fixed_ips is at least one

In DevStack-Gate, we are attempting to run dual stacked, so even when
running IPv6 tests, an IPv4 address will be present.

Change-Id: I303d15cdf9fb458df49e4b8eaf3adc41226bf176
Required-By: I3d416275f77913769b98e77f7e47bed17fc4d1cc
Remove unused TOKEN_CHARS_RE

TOKEN_CHARS_RE is not used in rest_client.py, and this patch
removes it.

Change-Id: I33db1b937efc6393d979da6c3f6b55cf31b5779c
Merge "Check that the number of fixed_ips is at least one"
Merge branch 'master' of https://github.com/openstack/tempest