Refresh server data after fip is assigned

Change I3e99304462950c194a4d73237cfc594631ca3868 introduced a
conditional testing and now such branch is probably not tested in
tempest upstream gate. The change introduced a comparison of floating ip
to server that has old data from time where it didn't have the floating
ip.

This patch refreshes server data before the comparison.

Change-Id: I8212b1d7b2804f4226fd2297c5c595fabcd26f89
Closes-bug: #1747623
1 file changed