Gerrit: bug db integration

Hi,

just for the record: we turned on gerrit's bug-db-integration machinery, 
i. e.
https://gerrit.libreoffice.org/#/c/286/

Our thanks go to Cedric for pointing that out and to Robert for 
configuring this.

All our 5 bug dbs are currently supported. To see which pattern binds to 
which db
i append the rules here.

Note 1: launchpad is currently missing in bin/lo-commit-stat
may be a good candidat for an easy hack?

Note 2: because of usage of non standard but really quickly regex engine
(http://www.brics.dk/automaton/) gerrit doesn't support case insensitive
regular expressions. That why we are doing this that (ugly) way:


[commentlink "freedesktop"]
        match = 
"(BUG|Bug|bug|BUGZILLA|Bugzilla|bugzilla|BZ|Bz|bz|TICKET|Ticket|ticket|fdo|FDO)\\s*:?\\s*#?(\\d+)"
        link = https://bugs.freedesktop.org/show_bug.cgi?id=$2

[commentlink "redhat"]
        match = "(rhbz|RHBZ)\\s*:?\\s*#?(\\d+)"
        link = https://bugzilla.redhat.com/show_bug.cgi?id=$2

[commentlink "novell"]
        match = "(bnc|BNC|n|N)\\s*:?\\s*#?(\\d+)"
        link = https://bugzilla.novell.com/show_bug.cgi?id=$2

[commentlink "apache"]
        match = "(ISSUE|issue|Issue|i|I)\\s*:?\\s*#?(\\d+)"
        link = https://issues.apache.org/ooo/show_bug.cgi?id=$2

[commentlink "launchpad"]
        match = "(lp|LP)\\s*:?\\s*#?(\\d+)"
        link = https://launchpad.net/bugs/$2


Regards
David