Fix skip tracker regex for multi-line skips

This commit changes the regex used for detecting a skip line by
removing the requirement on an '(' immediately following 'skip'.
This changes the skip tracker to match multiline skips (assuming
'skip' is on the same line as the bug number. It also enables
conditional skips that have a bug number from being picked up.

Change-Id: I95a0521661084034f7625c3c517ae9210120de4c
Merge "Fix skip tracker regex for multi-line skips"