This change enables the DVS credentials to be different from the
Nova credentails. We were pggbacking on top of those.
The new ones are:
DVS_VMWAREAPI_IP
DVS_VMWAREAPI_USER
DVS_VMWAREAPI_PASSWORD
DVS_VMWAREAPI_CA_FILE
DVS_VMWAREAPI_INSECURE
The original Nova ones are:
VMWAREAPI_IP
VMWAREAPI_USER
VMWAREAPI_PASSWORD
VMWAREAPI_CA_FILE
VMWAREAPI_INSECURE
Change-Id: I34bcbb12025470394b6e3a0f2df3122c869639d1
3e3c266649