Revert "Disable debug messages when running unit tests"

This reverts commit 56edda0d1840da1ccfcd7c35df397251ddb779db.

Another patch (commit-id: df96a03e6c74f1fceb4525900bca885307907b79) to
fix the same issue with less intrusive consequences was already merged
into master. There's still benefit to have debug logs if this does not
make gate jobs fail, so revert to previous setting value.

Related-Bug: 1316610
Change-Id: I9b57369027e1e43bed1bde4d971dee9fb7a26a47
Make VPNaaS 'InUse' exception more clear

In case IpSecPolicy or IKEPolicy is updated while VPN connection that uses it
is already established, IPsecPolicyInUse or IKEPolicuInUse is raised.
Need to clarify their messages to emphasize that policies can't be updated
because they are used by established connection.

Change-Id: I259f9b8bcff7f8ec13ac630285f6e881c6653309
Closes-Bug: #1315809
NSX: ensure that no LSN is created on external networks

Logical Service Nodes (LSN) are those that provide dhcp
and metadata services to networks when the NSX plugin is
used without the openstack dhcp and metadata proxy
agents. External networks do not work with Neutron's
dhcp and metadata services, therefore there is no need
to provision a LSN in this case.

Added UT to avoid regression.

Closes-bug: #1316795

Change-Id: I3dab0c9cbecdd9296466c991d02d590d6bd5bd49
Revert "Big Switch: Check source_address attribute exists"

This reverts commit 0dde14c0cd6ffea8ebff715342852ef17a9c0b70.

This fix only addressed part of the problem. The socket call
in python 2.6 does not accept an extra source address arg
either.

Change-Id: I4df4f66e9db0da1a8923ee37e918718f3bcf26ee
Partial-Bug: #1316382
Merge "Make VPNaaS 'InUse' exception more clear"
Merge "Revert "Disable debug messages when running unit tests""
Merge "NSX: ensure that no LSN is created on external networks"
Merge "Revert "Big Switch: Check source_address attribute exists""