ceph: add support to read custom namespace

Earlier, we have the support to read custom namespace
but there was bug that it was reading from wrong config
file. This commit fixes that bug.

Closes: rook#24
Signed-off-by: subhamkrai <srai@redhat.com>

kubectl-rook-ceph.sh

@@ -161,7 +161,7 @@ function run_help_command () {
 
 function run_ceph_command () {
   # do not call end_of_command_parsing here because all remaining input is passed directly to 'ceph'
-  kubectl --namespace "$NAMESPACE" exec deploy/rook-ceph-operator -- ceph "$@" --conf=/var/lib/rook/rook-ceph/rook-ceph.config
+  kubectl --namespace "$NAMESPACE" exec deploy/rook-ceph-operator -- ceph "$@" --conf="$CEPH_CONF_PATH"
 }
 
 ####################################################################################################
@@ -170,7 +170,7 @@ function run_ceph_command () {
 
 function run_rbd_command () {
   # do not call end_of_command_parsing here because all remaining input is passed directly to 'ceph'
-  kubectl --namespace "$NAMESPACE" exec deploy/rook-ceph-operator -- rbd "$@" --conf=/var/lib/rook/rook-ceph/rook-ceph.config
+  kubectl --namespace "$NAMESPACE" exec deploy/rook-ceph-operator -- rbd "$@" --conf="$CEPH_CONF_PATH"
 }
 
 ####################################################################################################
@@ -328,8 +328,9 @@ function run_main_command () {
 # MAIN: PARSE MAIN ARGS AND CALL MAIN COMMAND HANDLER
 ####################################################################################################
 
-# Default values for flag-controlled settings.
+# Default values
 NAMESPACE='rook-ceph' # namespace of the cluster
+CEPH_CONF_PATH="/var/lib/rook/$NAMESPACE/$NAMESPACE.config"
 
 # set_value_function for parsing flags for the main rook-ceph plugin.
 function parse_main_flag () {
@@ -339,6 +340,7 @@ function parse_main_flag () {
     "-n"|"--namespace")
       val_exists "$val" || return 1 # val should exist
       NAMESPACE="${val}"
+      CEPH_CONF_PATH="/var/lib/rook/$NAMESPACE/$NAMESPACE.config"
       ;;
     "-h"|"--help")
       flag_no_value "$flag" "$val"