Ignore interpolated selectors in SingleLinePerSelector

Disable checking of selectors that contain interpolation, since it's not
possible to determine whether the strings in those selectors are
properly formatted.

Change-Id: Ic93dab226b7cb0a8390d3b0dbcb859db3cf90757
Reviewed-on: http://gerrit.causes.com/40960
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>