Fixed single quoted check_multi labels

Not only standard, also check_multi labels might be enclosed with
single quotes: 'service::plugin::perfdata'=123
parse_perfstring now supports these single quoted labels.

ChangeLog

@@ -1,4 +1,5 @@
 **pnp-0.6.16 ??/??/2011**
+  * Bugfix:  Fixed single quoted check_multi labels (reported by Matthias Flacke)
 
 **pnp-0.6.15 09/15/2011**
   * Bugfix:  Fixed Overview link (reported by Stefan Triep)

scripts/process_perfdata.pl.in

@@ -986,7 +986,7 @@ sub parse_perfstring {
     #
     # check_multi
     #
-    if ( $perfstring =~ /^([a-zA-Z0-9\.\-_\s\/\#]+)::([a-zA-Z0-9\.\-_\s]+)::([^=]+)=/ ) {
+    if ( $perfstring =~ /^[']?([a-zA-Z0-9\.\-_\s\/\#]+)::([a-zA-Z0-9\.\-_\s]+)::([^=]+)[']?=/ ) {
         $is_multi = 1;
         print_log( "check_multi Perfdata start", 3 );
         my $count        = 0;
@@ -1001,7 +1001,7 @@ sub parse_perfstring {
                 @perfs = ();
                 last;
             }
-            if ( $p{label} =~ /^([a-zA-Z0-9\.\-_\s\/\#]+)::([a-zA-Z0-9\.\-_\s]+)::([^=]+)$/ ) {
+            if ( $p{label} =~ /^[']?([a-zA-Z0-9\.\-_\s\/\#]+)::([a-zA-Z0-9\.\-_\s]+)::([^=]+)[']?$/ ) {
                 @multi = ( $1, $2, $3 );
                 if ( $count == 0 ) {
                     print_log( "DEBUG: First check_multi block", 3 );