MDL-22060 fixed $a in string to match new rules

MDL-22060 fixed $a in string to match new rules

AMOS START
 REM fixed $a[] in [deleteuserrecord,core_mnet]
 REM fixed $a[] in [enrollingincourse,core_mnet]
 REM fixed $a[] in [noipmatch,core_mnet]
 REM fixed $a[] in [nonmatchingcert,core_mnet]
 REM fixed $a[] in [ssl_acl_allow,core_mnet]
 REM fixed $a[] in [ssl_acl_deny,core_mnet]
AMOS END