Provide support fot kolla dev mode in aodh. When
'kolla_dev_mode' or 'aodh_dev_mode' variables are
enabled, source code of aodh project is cloned
and bindmounted.
Partially implements: blueprint mount-sources
Co-Authored-By: wu.chunyang <wu.chunyang@99cloud.net>
Change-Id: I1235013ab2ff887c4311126cbff7367775f66347