Fix issue with validator when disable_ssl = true

https://github.com/puppetlabs/puppetlabs-puppetdb/issues/106
Enable soft_write_failure setting when $puppetdb::disablessl = true

The puppet agent will refuse to run if it can’t make a secure
connection to the puppetdb server.  This setting disables that in case
SSL is disabled.
Merge pull request #107 from ebarrere/ebFix_puppetdb_conn_validator

Fix puppetlabs#106 and one other bug when disable_ssl = true