Add galera monitoring variables

Based on work by <mrten+munin@ii.nl> submitted here:
https://github.com/kjellm/munin-mysql/commit/19aa49f14368a35909cf4f23b4fc591cad5e3b67
ignore 'INDIVIDUAL BUFFER POOL INFO' section in MySQL 5.5

If you set innodb_buffer_pool_instances to a value greater than 1 the status
will show a new section with details about each buffer pool instance.
I think the details a currently not needed so just ignore the section.
fix parsing file io for MySQL 5.5

In MySQL 5.5 the innodb status shows additionally aio reads and aio writes for
each thread in square brackets.
fix parsing insert_buffer_and_adaptive_hash_index for MySQL 5.5

Closes munin trac ticket #1355.
fix Use of uninitialized value in printf

This fixes the case you have activated mysql_replication plugin but don't have
replication enabled in MySQL.
Without this you see the following error messages:
Use of uninitialized value in printf at /etc/munin/plugins/mysql_replication line 885
MRG: from https://github.com/cloos/munin.git branch: mysql-5.5-compatibility
Break mysql innodb data on full sections

Patch from Jan Mara
https://github.com/jmara/ubuntu-munin-mysql/commit/77ae2b2d8bc1233e0f0b0e6346d66b955441ba14
Fix spelling in mysql plugin for warning
Fix name of slave variables and initialize other variables in case slave isnt active
Capture a bit more information for mysql-5.5+ on innodb status
better handling of undefined data
Fix formatting of literal block
Add a script to output useful "support information"

 - Probably mostly useful for bug reports
Merge pull request #217 from afrepues/patch-1

Fix formatting of literal block
Handle big numbers better in sprintf

Using «sprintf(%d, $float)» has the potential for an integer overflow. Ick.

It is being converted to a string anyway, so cut the float at the «.», and keep the rest.
Merge branch 'mysql-5.5-for-merge' of github.com:openquery/munin-upstream into mysql-5.5-for-merge
Merge branch 'galera' of github.com:openquery/munin-upstream into galera
fix wsrep_flow_control_sent/wsrep_flow_control_recv as DERIVES and make the wsrep_flow_control_recv -ve on same graph
galera flow control paused to own graph with warning at 0.1 and critical at 0.9
syntax fixes