CORTX-30083: Fix Codacy issues under "net" directory (#1935)

Problem:		
Codacy error "Double quote to prevent globing and words splitting".

Solution:
We are putting the variable references in double quotes.

Signed-off-by: Vinoth.V <vinoth.v@seagate.com>

net/test/st/run-1x1.sh

@@ -57,7 +57,7 @@ node_start_addr()
 		DIR_COUNTER=$(($DIR_COUNTER + 1))
 		"$CMD_M0NETTESTD" -a "$addr" -c "$addr_console" &
 		popd > /dev/null
-		eval PID_"$4"=$!
+		eval PID_"${pid_role}"=$!
 	fi
 }
 
@@ -145,7 +145,7 @@ fi
 		 "$PARSABLE" \
 		 $BULK_PARAMETERS &
 PID_CONSOLE=$!
-wait $PID_CONSOLE
+wait "$PID_CONSOLE"
 
 # The same time for fini
 sleep "$NODE_INIT_DELAY"

net/test/st/st-bulk.sh

@@ -21,15 +21,15 @@
 
 CWD=$(cd "$( dirname "$0")" && pwd)
 
-source $CWD/st-config.sh
-TEST_TYPE="bulk"
-MSG_NR=1048576
-MSG_SIZE=1m
-CONCURRENCY_CLIENT=8
-CONCURRENCY_SERVER=16
-BD_BUF_NR_CLIENT=16
-BD_BUF_NR_SERVER=32
-BD_BUF_SIZE=16k
-BD_BUF_NR_MAX=8
+source "$CWD"/st-config.sh
+export TEST_TYPE="bulk"
+export MSG_NR=1048576
+export MSG_SIZE=1m
+export CONCURRENCY_CLIENT=8
+export CONCURRENCY_SERVER=16
+export BD_BUF_NR_CLIENT=16
+export BD_BUF_NR_SERVER=32
+export BD_BUF_SIZE=16k
+export BD_BUF_NR_MAX=8
 
-source $CWD/run-1x1.sh
+source "$CWD"/run-1x1.sh