Add a combination of commands to allow users to show existing stashed
connection_info for a volume attachment and update volume attachments
with fresh connection_info from Cinder by recreating the attachments.
Unfortunately we don't have an easy way to access host connector
information remotely (i.e. over the RPC API), meaning we need to also
provide a command to get the compute specific connector information
which must be run on the compute node that the instance is located on.
Blueprint: nova-manage-refresh-connection-info
Co-authored-by: Stephen Finucane <stephenfin@redhat.com>
Change-Id: I2e3a77428f5f6113c10cc316f94bbec83f0f46c1
e906a8c0ec