Also needed to switch charm to use _stored rather than
state inline with ops framework change.
Related-Bug: 2002788
Change-Id: I0bf8ece1f930157e6a4fad087d8c24ad5f5cfe6b
Adds necessary requirements, osci.yaml, charmcraft.yaml etc for
migrationg to charmhub. Additionally, adds xena and yoga tests and
updates the charm overlay for appropriate netapp values.
local_overlay_enabled is set to True as it now defaults to False.
Note that the actual functional tests are still disabled due to [1]
1 - https://bugs.launchpad.net/charm-manila-netapp/+bug/1922214
Change-Id: Ic9354434792ec1faa42406f4f3cf461a96cfc020