logdir local

Change-Id: I81b12b6b039950cb5791d6d2b2a78289deaba02f
Deprecate SCREEN_LOGDIR in favor of LOGDIR

This is the first step in the log file cleanup.  If SCREEN_LOGDIR
is still set, symlinks will be created in the old screen log directory
so things like the devstack-gate log collector continues to work.

bp:devstack-logging-and-service-names
Change-Id: I3ac796e322a18dbd0b8b2310a08310ca159d7613
debugging

Change-Id: I0471bf89598719df4922c33af445db8490a7d9c1
Set default for LOGDIR

Change-Id: I1fca16fa4e857c624c5b1fb1bc87df774ff92520
Merge branch 'rename-screen-logs' into dt-test
Merge branch 'screen-logdir-again' into dt-test
Merge branch 'nonovnc' into dt-test
Merge branch 'identity-v3-default' into dt-test
Merge branch 'conf-tempest' into dt-test
Merge branch 'test-service-functions' into dt-test
Merge branch 'exercise-refresh' into dt-test