check_oracle: --db +ASM bad string matching

check_oracle doesn't correctly check for pmon +ASM instance from at least Oracle 11 as the pmon proces was renamed from ora_pmon_.* to asm_pmon_.*.
--
Just turning attached patch of github issue #1207 into a push request.
(Closes #1207)

plugins-scripts/check_oracle.sh

@@ -164,6 +164,7 @@ case "$cmd" in
     ;;
 --db)
     pmonchk=`ps -ef | grep -v grep | grep -c "ora_pmon_${2}$"`
+    pmonchk=$(($pmonchk+`ps -ef | grep -v grep | grep -c "asm_pmon_${2}$"`))
     if [ ${pmonchk} -ge 1 ] ; then
 	echo "${2} OK - ${pmonchk} PMON process(es) running"
 	exit $STATE_OK