1.1.0 release prep

add a metric for last successful file-sync commit

This commit updates the service management logic for grafana to drop the
creation of the /run/grafana directory prior to starting the service on
CentOS 7. Grafana 4.5.0 and later manage this by setting the RuntimeDirectory
option in the grafana-server.service unit file. However, CentOS 7 uses systemd
v219 which will fail during startup if the directory specified by
RuntimeDirectory already exists. This failure causes the first catalog
application that installs and starts grafana-server to fail --- which is
particularly problematic for Bolt plans that only run once.

Fixes #37.

Prior to this commit, the spec tests for the ubuntu /run/grafana
resources were present but no longer valid. This commit removes these
tests and removes the rubocop exclusion that allowed them.

Stop creating /run/grafana on CentOS 7

add puppetdb heap / status

fix grafana version req.  This fixes #43

This commit updates the master_list, puppetdb_list, and postgres_host_list
parameters to allow pairs of `[hostname, port_number]` in addition to just
a hostname. If the port number is specified, then Telegraf will be configured
to use that port when requesting metrics from the host. If no port number is
specified, then Telegraf will be configured to use the default prts of
8140 for Puppet Server, 8081 for PuppetDB, and 5432 for Postgres.

Closes #48

Improve support for FOSS puppet dashboards

Allow port numbers of services to be specified

1.1.5 release prep