Adds help text to brocade configuration options

Help text was added to the configuration options defined in the brocade neutron
plugin. This help text should assist users of the brocade plugin. The OSTYPE
configuration option was not used in the plugin and was labeled as such so a
user of the plugin would not worry about the meaning of it.

The example etc file /etc/neutron/plugins/brocade/brocade.ini has been updated
to share the same help values where applicable.

Fixes-Bug: #1157511

Change-Id: Ie068396e77902037a7a0b5334d4dfb0dcdd3575e
Register an extend_dict function for ext_gw_mode extension

Bug 1223585wq

Use dict extension methods instead of overriding make_router_dict in
order to make this extension consistent with all the others.

Change-Id: I94fa7e70e5a869963ec4dfa9de85c8d922976843
Imported Translations from Transifex

Change-Id: I8de01b47a78ae301d9760ee8ab0e596e967e333f
Merge "Register an extend_dict function for ext_gw_mode extension"
Merge "Imported Translations from Transifex"