Partial revert 'Fix variable names that star with "_"'
Partial revert 'Fix variable names that star with "_"'

This partialy reverts commit fde5dc7412b54204089509a94b824aa53d8a3366

Variable names starting with underscore are permitted
in Puppet 4.x for local scope variables. Whis is this
case.

netflash/puppet-serial_console,CERIT-SC/puppet-serial_console,netflash/puppet-serial_console,CERIT-SC/puppet-serial_console