mgr/cephadm: use double quotes for NFSv4 RecoveryBackend in ganesha conf

This came directly from someone on the ganesha team. We've actually had
this use single quotes for a long time (at least since mid 2020) but I
believe recent feature work on the ganesha side exposed the issue

ganesha.nfsd-2[main] config_errs_to_log :CONFIG :WARN :Config File (/etc/ganesha/ganesha.conf:13): Unknown token ('rados_cluster')

Fixes: https://tracker.ceph.com/issues/69930

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

Author: adk3798

src/pybind/mgr/cephadm/templates/services/nfs/ganesha.conf.j2

@@ -18,7 +18,7 @@ NFS_CORE_PARAM {
 
 NFSv4 {
         Delegations = false;
-        RecoveryBackend = 'rados_cluster';
+        RecoveryBackend = "rados_cluster";
         Minor_Versions = 1, 2;
         Server_Scope = {{ cluster_id }}-{{ namespace }}
 {% if nfs_idmap_conf %}

src/pybind/mgr/cephadm/tests/test_services.py

@@ -3251,7 +3251,7 @@ def fake_keys():
             '\n'
             'NFSv4 {\n'
             '        Delegations = false;\n'
-            "        RecoveryBackend = 'rados_cluster';\n"
+            '        RecoveryBackend = "rados_cluster";\n'
             '        Minor_Versions = 1, 2;\n'
             f'        Server_Scope = {cephadm_module._cluster_fsid}-foo\n'
             '        IdmapConf = "/etc/ganesha/idmap.conf";\n'