Do not use test.get_service_list()

Currently 'network' service is always True in test.get_service_list()
S check for the same is not much of use.
Also Tempest is moving the get_service_list from test.py to utils.
- Ibd52153d00b8e60fb8c89e38d94e358ddc787251

Till that movement is done, let's comment the usage of get_service_list
and if needed to check 'network' service availability, then get_service_list
can be used from new location.

Change-Id: I8edd8da695698db03a752dcfedbd290facfa8fca
1 file changed