Remove unnecessary regex grouping

Several regexes in this class used had unnecessary (\s+) grouping.  This
change makes the regexes slightly cheaper by removing the need for the
regex engine to remember the whitespace that was matched.

Change-Id: I9381c213efe093dc472b0c7e9d7b303a0c7cb13b
Correct invalid indentation in is_dvr_serviced

This change corrects indentation in is_dvr_serviced defined in
neutron.common.utils modul.

Change-Id: Ie0e7885ccf6e9101c6ad638b410bf17e359c5a0a
Merge "Remove unnecessary regex grouping"
Merge "Correct invalid indentation in is_dvr_serviced"