Persist usage start and end dates in the session

This patch adds the usage start and end dates to the user's session
so they are saved while navigating between pages.

Closes-Bug: #1373651
Change-Id: I3046b5533eb96f85fb2f90e63b3ff84360ad14c4
Add HA mode support for Neutron router

HA (high availability) mode support is one of the important topics in
Neutron Juno, and this patch adds HA router mode support to Horizon.

This commit also changes the default value of enable_distributed_router
in the example local_settings.py to False. In Juno release of Neutron,
the distributed router and L3 HA mode cannot be enabled at the same
time and only L3-agent deployment with L3 Router service plugin
support both features. Thus I believe it is reasonable to make both
options default to False to avoid unnecessary confusions to operators.

Closes-Bug: #1370110
Change-Id: I77b0292b761f08b4580846f6d58443f7df9a1f6b
Use identity operator in horizon.modals.js

jshint logs usage of the equality operator as an error.

Change-Id: Ia5478981f6ce87e77c65bcc569ae542eeeff099f
Closes-Bug: #1375401
Updated from global requirements

Change-Id: I5ebf657fddc2ba901ea98af93586eb6daa518ac2
Imported Translations from Transifex

Change-Id: Ic411f3e892bfbfef4fba0723b63e01cc7b8939fd
Merge "Persist usage start and end dates in the session"
Merge "Use identity operator in horizon.modals.js"
Merge "Imported Translations from Transifex"
Merge "Add HA mode support for Neutron router"
Merge "Updated from global requirements"