netapp: auto-recover replicas stuck behind source volume clone split

[Carthaca]

Replica create/mount and the periodic replica state update could get
stuck when creating a SnapMirror snapshot failed with:

Volume Clone Split is in progress on the source volume.

wait_for_mount_replica() treated any terminal SnapMirror error as
permanent and raised NetAppException immediately, so periodic updates
never retried. Separately, update_replica_state() treated any
NaApiError from create/resync as STATUS_ERROR, which also stopped
automatic recovery once the transient backend condition cleared.

Also, for a SnapMirror relationship that is present but still
'uninitialized' (baseline transfer never completed), periodic update
called snapmirror resume/resync instead of snapmirror initialize.
Per NetApp documentation, resync resynchronizes a previously
initialized relationship (e.g. broken-off, or missing a common
snapshot); it does not start the baseline transfer. An uninitialized
relationship therefore never progressed even after the clone split
condition cleared.

Add a shared clone-split matcher and:

• wait_for_mount_replica(): retry (ShareBusyException) instead of
  failing fast when the terminal SnapMirror error is caused by a
  source volume clone split still in progress.
• update_replica_state(): keep the replica in
  REPLICA_STATE_OUT_OF_SYNC (instead of STATUS_ERROR) when
  create/initialize/resync fails due to the same transient clone
  split condition, so the next periodic replica state update retries
  automatically.
• update_replica_state(): call snapmirror initialize (not
  resume/resync) when the relationship is still uninitialized, so it
  can actually complete its baseline transfer once the source volume
  clone split finishes.

Change-Id: Id8d85400eb2990b455d4fede60c342d7bf62509a
Signed-off-by: Maurice Escher maurice.escher@sap.com
Co-authored-by: Copilot App 223556219+Copilot@users.noreply.github.com

[kpawar-sap]

can you rebase, py3 would pass.

[Carthaca]

I had to retrigger the checks, now they are green :)