LBaaS: Set correct nullable parameter for agent_id

Corrected the following model according to database
content:
 - NOT NULL for PoolLoadbalancerAgentBinding agent_id;

Partial-bug: #1296282

Change-Id: I1f11ec2e8f4c16f58dd8d4e6429e46eaedaec945
Segregate the VSM calls from database calls in N1kv plugin

Rearrange the code in such a way that the calls to the VSM are
outside the database session. This avoids DB locks on n1kv tables.

Change-Id: Ic0f0d816cca06a3b03fdd9b58ee7599ddf65473e
Closes-Bug: 1290646
Cisco VPN device driver - support IPSec connection updates

Provides support for IPSec connection updates and state changes. To do
this, the configuration of the connection is maintained, when the
connection is created. This is checked against the current settings, at
sync time, to determine whether a configuration change (as opposed to a
state change) has occurred.

If there is a change to the configuration detected, then the simple
approach is taken of deleting and then re-creating the connection, with
the new settings.

In addition, if the admin state of the connection changes, the tunnel
will be taken admin down/up, as needed. Admin down will occur if the
IPSec connection or the associated VPN service is set to admin down.
Admin up will occur, if both the IPSec connection and the VPN service
are in admin up state.

Added REST client method to allow changing the IPSec connection tunnel
to admin up/down (effectively doing a no-shut/shut on the tunnel I/F),
based on the above mentioned state.

Modified UTs for the support of IPSec connection update requests (used to
throw an "unsupported" exception), and to check that the configuration
and state changing are processed correctly.

Updated so that tunnel_ip is set in device driver, rather than hard
coding, and then overriding in REST client. Since device driver has the
same info, this will fit into future plans to obtain the info from
router, vs reading an .ini file. Revised UTs as well.

Change-Id: I184942d7f2f282c867ba020f62cd48ec53315d3e
Closes-Bug: 1303830
Fix network profile subtype validation in N1kv plugin

Network profile of type Trunk expects a subtype field for
creation. If a subtype is missing in the request body, plugin
should raise an exception. This patch fixes the validation logic
to detect missing subtype field.

Change-Id: I6b4fb533576a317f7d568b4a0fe4117b5464ffa6
Closes-Bug: 1315197
Improve help strings for radware LbaaS driver

Make strings consistent with what we use elsewhere:
* Capitalize first word
* End with "."
* Improve wording and spelling

Partial-Bug: #1315111
Change-Id: Ic378aa7e4f936c3f3da0a23598620c3b978cbf45
Merge "Fix network profile subtype validation in N1kv plugin"
Merge "Cisco VPN device driver - support IPSec connection updates"
Merge "Segregate the VSM calls from database calls in N1kv plugin"
Merge "LBaaS: Set correct nullable parameter for agent_id"
Merge "Improve help strings for radware LbaaS driver"
Imported Translations from Transifex

Change-Id: I3445e80a6b48d11692f42c116d1335cfd048bb77