cephadm: bootstrap: verify orch module is running before setting cephadm backend

There have been occasional failures when bootstrapping with error
messages like

```
Module 'orchestrator' is not enabled/loaded (required by command 'orch set backend'): use `ceph mgr module enable orchestrator` to enable it
```

despite the orchestrator being meant to be an always on module.

Since trying to enable an already enabled module causes no issues,
trying to enable it ourselves seems like a sensible workaround.

Fixes: https://tracker.ceph.com/issues/67969

Signed-off-by: Adam King <[email protected]>

Author: adk3798

src/cephadm/cephadm.py

@@ -2408,6 +2408,12 @@ def enable_cephadm_mgr_module(
     logger.info('Enabling cephadm module...')
     cli(['mgr', 'module', 'enable', 'cephadm'])
     wait_for_mgr_restart()
+    # https://tracker.ceph.com/issues/67969
+    # luckily `ceph mgr module enable <module>` returns
+    # a zero rc when the module is already enabled so
+    # this is no issue even if it is unnecessary
+    logger.info('Verifying orchestrator module is enabled...')
+    cli(['mgr', 'module', 'enable', 'orchestrator'])
     logger.info('Setting orchestrator backend to cephadm...')
     cli(['orch', 'set', 'backend', 'cephadm'])