[FEATURE] Command to flush only particular cache (Revision 1)

This introduces a command typo3.flow:cache:flushone with an
additional identifier option, to clear only that particular cache
with this identifier.

Change-Id: Ic342a55f422bd0f63be63544b78a62ad1903c815
Releases: master
Revision-Id: f3ace6e847d3cc0dab4ef937d91619ee3b3c692b