(maint) Test a different cert for extensions

The FOSS ssl/certificate_extensions test expects to be able to clear out
the ssl store and start again.  This is not feasible in PE; the solution
is to run the test against a differente certname.  Also leaving temp
dirs in place, because it makes it much easier to review the files that
were used when troubleshooting test failure.
Merge branch 'maint/stable/ssl-cert-ext-acceptance-fix-for-pe' into stable

* maint/stable/ssl-cert-ext-acceptance-fix-for-pe:
  (maint) Test a different cert for extensions
(packaging) Update PUPPETVERSION to 3.6.1
(maint) Remove travis jobs which we know are failing to speed up travis runs.
Merge pull request #2693 from kylog/maint/remove-failing-travis-jobs

(maint) Remove travis jobs which we know are failing to speed up travis ...
(maint) Use the travis config used on master to workaround rvm issues