Add support for RHEL 7

[cmurphy]

EPEL 7 packages mongodb with a different pidfile path than prior
package versions. This commit updates the pidfile path in params.pp so
that the service can start if installed from epel. It also fixes the
spec helper so that iptables can be stopped on RHEL 7.

[hunner]

This should be on hosts if we want the replset tests to work (because they are multi-host): https://github.com/puppetlabs/puppetlabs-mongodb/blob/master/spec/acceptance/replset_spec.rb

[cyberious]

Agreed @hunner but this is a pattern we are already using which will only apply to default host which is required with newer versions of beaker.

[hunner]

@cyberious The "pattern we are already using" doesn't apply to this module, since if you look at the rest of the spec helper you'll see that the de facto pattern is to use on hosts (precisely because of the multi-node tests).

In multi-node tests there is no "default host," though there may be a host with the default role.

[cyberious]

perhaps an on agents or on hosts should be updated if this is a requirement of mongodb testing.

[hunner]

Ah yes, on agents would probably be preferable; the tests were written using POSS and masterless so I didn't have that issue.

[cmurphy]

Since the rest of this spec helper is using on hosts I think it is best to use on hosts for this line as well since the rest of the test setup is being applied to all hosts. PR in #155

[iNecas]

Any reason for opening a new PR as opposed to accepting an exiting one in #148. Just asking…

[cyberious]

The additional change to ensure spec acceptance worked as well for rhel 7 is my guess that a new PR was cut.

[cmurphy]

@iNecas I apologize, I scanned the PR queue for this fix and #148 didn't catch my eye. I should have actually examined it. Looking at it now, it looks like a more complete solution, so I will revert this one and merge the other.