Add a ignore_unknown node-level directive, allowing to selectively ignore unknown values when running munin-limits.
Also ignore transitions from UNKNOWN to OK.
Don't bail out, just prevent the state from changing.
p/df: also ignore devtmpfs

devtmpfs should be excluded by default also.

I explicitly don't exclude tmpfs as it is quite useful as metric.

Closes: D:710899
Merge branch 'fix/d/710899' into stable-2.0
Removed empty lines in plugin output
Remove typo in the example rrdcached socket documentation
plugins/df_abs: fix the multiple block device

The special devices like tmpfs or none can appear multiple times,
so we need to append the mount point.

Closes: D#712793
Merge branch 'fix/d/712793' into stable-2.0
plugins: fix typo (Muning::Plugin::HTTP)
master: do not use -p $port if unset in ssh url

If the port part is not specified in the address url, we should not
substitute it to 22.

This enables the choice to be made in /etc/ssh/ssh_config
Merge pull request #116 from steveschnepp/ignore-sandbox

gitignore: ignoring output dir sandbox/

Conflicts:
	.gitignore
master: adding translucent AREA+STACK
common: add missing keywords

In commit d2f9ce0cc14efd02cbab0ff1c736e0764104d771, a new keyword was
introduced : "global_timeout".

But it can't actually be specified in munin-node.conf.

This commit also adds "timeout" in the master and "spooldir" in the node
common: refactor the keywords to ease changes

Using one keyword per line, ordered alphabetically enables a very easy change
tracability
travis: adding perl 5.18
travis: build the master branch
node/t: adding some time to the test

Perl 5.18 takes longer than previous versions
master: fix "graph_period hour"

The "graph_period hour" setting does not work as expected, it stays "second".

Closes: #1305
Merge branch 'fix/1305-graph-period-hour-not-working' into stable-2.0