qa: configure balancer for multi-mds workloads

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>

qa/suites/fs/workload/ranks/multi/balancer/automatic.yaml

@@ -0,0 +1,4 @@
+tasks:
+- exec:
+    mon.a:
+      - ceph fs set cephfs balance_automate true

qa/suites/fs/workload/ranks/multi/balancer/distributed.yaml.disabled

@@ -0,0 +1,6 @@
+# distributed pins would be interesting if we had workloads on multiple clients. We do not yet. So it's disabled.
+tasks:
+- exec:
+    mon.a:
+      - ceph fs set cephfs balance_automate false
+      - ceph fs subvolumegroup pin cephfs qa distributed 1

qa/suites/fs/workload/ranks/multi/balancer/random.yaml

@@ -0,0 +1,10 @@
+overrides:
+  ceph:
+    conf:
+      mds:
+        mds_export_ephemeral_random_max: 0.10
+tasks:
+- exec:
+    mon.a:
+      - ceph fs set cephfs balance_automate false
+      - ceph fs subvolumegroup pin cephfs qa random 0.10