common admin: add admin.go file with basic admin type

Signed-off-by: John Mulligan <jmulligan@redhat.com>

common/admin/manager/admin.go

@@ -0,0 +1,17 @@
+package manager
+
+import (
+	ccom "github.com/ceph/go-ceph/common/commands"
+)
+
+// MgrAdmin is used to administrate ceph's manager (mgr).
+type MgrAdmin struct {
+	conn ccom.RadosCommander
+}
+
+// NewFromConn creates an new management object from a preexisting
+// rados connection. The existing connection can be rados.Conn or any
+// type implementing the RadosCommander interface.
+func NewFromConn(conn ccom.RadosCommander) *MgrAdmin {
+	return &MgrAdmin{conn}
+}