Process name regexp with | breaks check_snmp_process perfdata output

[pboguslawski]

When check_snmp_process.pl is executed with regexp containing pipe sign i.e. -n '^rsyslogd$|^named$', text message in output contains | and is recognized as start of perfdata which breaks processing it.

Seems pipe cannot be escaped there so consider replacing | with its HTML entity | i.e. by inserting

$o_descr =~ s/\|/|/g;

in line 847.