Inline "for val in [ref]" statements

This change increases readibility by inlining "for val in [ref]":

 for val in [ref]:
   f(val)

becomes:

 f(ref)

Change-Id: I8e1f95bd7eb99a25c6460beb2ac3230c53740181
NSX: log request body to NSX as debug

Previously we never logged the request body that we sent to NSX. This makes
things hard to debug when issues arise as we don't actually log the body of
the request that we made. This patch adds the body to our issue request log
statement.

Change-Id: I7d98e3d844ebe565fb5919aac3f9afd5b4040e69
Closes-bug: 1360394
remove explicit include of the ovs plugin

On installing only neutron-linuxbridge-agent package, the
dhcp cannot start successfully because of the imports from
ovs plugin. This change removes the explicit include of the
ovs plugin from ovs_lib.py. INVALID_OFPORT has been moved to
ovs_lib.py while VXLAN_UDP_PORT has moved to
plugins/common/constants.py. The imports for these 2 constants
in files which uses it has been corrected to new location.

Closes-Bug: #1271449
Change-Id: I6559cb43d1b10b4f926c453a103b12017b59f259
Merge "NSX: log request body to NSX as debug"
Merge "remove explicit include of the ovs plugin"
Merge "Inline "for val in [ref]" statements"