[BHV-17002]Contextual popup doesn't work as expected when spotlightModal: true

Issue: When spotlightModal: true on contextual popup other controls
shouldnot get focus
Cause: There is no mechanism in contextual popup to deal with
spotlightmodal and spotlight focus.
Fix: Spotlight focus mechanism is added in the contextual popup to
handle this case.
DCO-1.1-Signed-Off-By: Rajyavardhan P <rajyavardhan.p@lge.com>
Merge pull request #1754 from enyojs/BHV-17002-rajyavardhan.p

[BHV-17002]Contextual popup doesn't work as expected when spotlightModal...

Reviewed-By: Derek Anderson (derek.anderson@lge.com) 
Integrated-By: Ryan Duffy (ryan.duffy@lge.com)