Synced log module and its dependencies from olso-incubator

Old version of 'log' module depended on oslo-incubator RPC layer
implementation. This sync is intended to copy the following fix that
makes log module use oslo.messaging.notify.log_handler if available:

  * 109e325e: Use oslo.messaging to publish log errors

blueprint oslo-messaging

Change-Id: Ieb26df4e9fbb2aa4d319c79be7510006fc8461ab
Fixed dhcp & gateway ip conflict in PLUMgrid plugin

   * Adjust dhcp IP if conflicts with gateway IP
   * Added unit test case

Closes-Bug:1333442
Change-Id: Iaa4e63faf28b783e6b5dbc50035ca50ccde9951a
ofagent: Use port desc to monitor ports on br-int

also, use ofport.name as device identifiers.
sprinkle some TODO comments.

Implements: blueprint ofagent-port-monitor
Change-Id: I4995964f37729f954fec71c4a2e61e463a430b1a
Exit rpc_loop when SIGTERM is recieved in ovs-agent

Previously ovs-agent exited with exit code 1 after SIGTERM was received.
SIGTERM should shutdown agent gracefully and exit code should be 0.

Closes-Bug: #1334264
Change-Id: I23e81cee5ae9e9fdabbe1377420b0902f47be8a7
Use patch ports to interconnect integration/physical bridges

Use by default patch ports to interconnect the integration to
physical bridges for the openvswitch agent in order to increase
performance.

For ovs/kernel without ovs patch port support on kernel side, veths
can be used through the new option OVS.use_veth_interconnection.

Patch port support can be tested using:

    neutron-sanity-check --ovs_patch

DocImpact
Closes-Bug: #1285335
Change-Id: I47106e57bf5b23891d7bf43815959e0d10156fba
Add config for performance gate job

This rally scenario is intended to be run in OpenStack CI
by rally-dsvm-neutron-neutron job.

Implements: blueprint neutron-performance-gate-jobs
Closes-Bug: #1334434
Change-Id: If204f3dfc32933792d09fdc929c248fc3f17b0bc
Merge "Use patch ports to interconnect integration/physical bridges"
remove unsupported middleware

the audit and notifier middleware from oslo-incubator are not
compatible with oslo.messaging. remove these middleware.

Change-Id: I456c2aa5f24ef977949f589f72d521514d5e97e4
Use correct MAX_LEN constant in agent functional tests

Closes-bug: #1334922

Change-Id: I62bd12da21e778f5cca97d6280c107575d912a81
Merge "Add config for performance gate job"
Merge "Exit rpc_loop when SIGTERM is recieved in ovs-agent"
Merge "remove unsupported middleware"
Merge "Fixed dhcp & gateway ip conflict in PLUMgrid plugin"
Merge "ofagent: Use port desc to monitor ports on br-int"
Merge "Use correct MAX_LEN constant in agent functional tests"
Merge "Synced log module and its dependencies from olso-incubator"