minor : fixing rq script -a option to work without arguments (#21766)

* minor : fixing -a to work without arguments

* Modified the usage statement

Author: arindam-bandyopadhyay

main/appserver/tests/rq.sh

@@ -174,9 +174,9 @@ find_test_job(){
 }
 
 USAGE="Usage:\n\n 1. rq.sh -l ---> List all available test identifiers without running them\n\
-	   2. rq.sh -b -a ---> For running all tests\n\
-	   3. rq.sh -b -g <test_group_name> ---> For running a test group\n\
-	   4. rq.sh -b -t \"<test_id1> <test_id2> <test_id3>\" ---> For running a space separated list of tests"
+	   2. rq.sh -b <branch> -a ---> For running all tests\n\
+	   3. rq.sh -b <branch> -g <test_group_name> ---> For running a test group\n\
+	   4. rq.sh -b <branch> -t \"<test_id1> <test_id2> <test_id3>\" ---> For running a space separated list of tests"
 
 list_test_ids(){
 	for runtest in `find . -name run_test\.sh`; do
@@ -205,7 +205,7 @@ then
     echo -e $USAGE
     exit 0
 fi    
-while getopts ":b:t:g:a:l" opt; do
+while getopts ":b:t:g:al" opt; do
     case "$opt" in
     b)	branch=$OPTARG;;
     t)  test_ids=($OPTARG);;