Added "allow_mixed_datastores" parameter to director configuration so dev instances can use the same datastore pattern for persistent and non-persistent datastores.
Added "allow_mixed_datastores" parameter to director
configuration so dev instances can use the same
datastore pattern for persistent and non-persistent
datastores.

Change-Id: Id092b5b0215738ba102672301a9f56616aedd259

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh