[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 #1769 from enyojs/BHV-17002-rajyavardhan.p-2.5.2-pre.8

BHV-17002 (2.5.2-pre.8)

Integrated-By: Aaron Tam (aaron.tam@lge.com)