Added support of per-tenant-user quotas

Added new keys '--user' in v1.shell to quota-show, quota-update.
Added command quota-delete, that provides ability for admins
to be able to delete a non-default quota (absolute limit) for a tenant
or user, so that tenant's quota will revert back to the configured default.
Added 'responce_key' parameter to Manager._update function
Added '--force' parameter to quota-update to support new functionality
on server
Fixes help output, when in 'manila help' was displayed only first
string of command documentation

Implement bp: user-quota-support

Change-Id: Ibfe9ccf83ea43d5af6652342f1fe6a88c78a0364