qa/suites/rados/mgr: use only one objectstore instead of all

I think we have enough coverage. Always testing all
objectstores is a bit excessive in my opinion

Signed-off-by: Sebastian Wagner <sewagner@redhat.com>

diff --git a/qa/suites/rados/mgr/objectstore b/qa/suites/rados/mgr/objectstore
deleted file mode 120000 (symlink)
index 848c65f..0000000
--- a/qa/suites/rados/mgr/objectstore
+++ /dev/null
@@ -1 +0,0 @@
-.qa/objectstore_debug
\ No newline at end of file

diff --git a/qa/suites/rados/mgr/random-objectstore$ b/qa/suites/rados/mgr/random-objectstore$
new file mode 120000 (symlink)
index 0000000..848c65f
--- /dev/null
+++ b/qa/suites/rados/mgr/random-objectstore$
@@ -0,0 +1 @@
+.qa/objectstore_debug
\ No newline at end of file