Fixes external network creation

Fixes external network creation

Without specifying the provider network type or physical network results
in the default tenant network type being used upon external network
creation (for us this means vxlan).  Previously this worked fine because
Neutron L3 agent and ODL L3 would assume to use br-ex.  This is no
longer true in ODL new nettvirt, and needs to be explicitly flat along
with the correct physical network.

Also includes minor fix for Manila service naming that was fixed
upstream.

JIRA: APEX-300

Change-Id: If5d467a811baafe01b725dd530938482fdd3fd03
Signed-off-by: Tim Rozet <trozet@redhat.com>