Added check on plugin.supported_extension_aliases

Added check to neutron.api.extensions.PluginAwareExtensionManager
which raises an exception when an alias in the plugin's
supported_extension_alias list is not found in the set of loaded
extension aliases. If an alias is missing, it means the extension for
that alias has not been found and has not been loaded. This guards
against a common class of bugs in plugins, typographical errors in
the `supported_extension_aliases` property. Also, added and updated
unit tests.

Plugin changes:

* bigswitch.plugin: Moves api_extensions_path override to plugin's
__init__ method, similar to other plugins.

* cisco.n1kv.n1kv_neutron_plugin: Removes "policy_profile_binding" and
"network_profile_binding" as they don't exist in Neutron currently.
Extended override of api_extensions_path to append cisco extensions
path to existing configured path.

* cisco.network_plugin: Renames "Cisco Credential" to "credential".
Adds api_extension_path override to plugin's __init__ method.

* metaplugin.meta_neutron_plugin: Avoids alias of empty string when
cfg.CONF.META.supported_extension_aliases is an empty string.

* midonet.plugin: Fixes regression from 715b16ac.

* nec.nec_plugin: Extended override of api_extensions_path to append
nec extensions path to existing configured path.

* nicira.NeutronPlugin: Extended override of api_extensions_path to
append NXP_EXT_PATH to existing configured path.

Fixes: bug 1225080

Change-Id: Idcaade221d83c611fcbd87b503b2c8377d106962