Sysctl: break broken file again
Pam: override self.target properly
WIP: fix use of seq entries with Puppet 3.4 optimisation

* pg_hba test failures
* mailalias test failures
  (probably shouldn't assume order of resource exec)

Fixes #101
Fix 101-seq-shared branch:

  Expose next_seq as class method
  Use path_label to calculate next element
  Loosen check for order in specs