Replace is_array with Puppet 4 native comparision

Pass java_cmd to start_slave.sh (OS X)

fix puppet_helper.groovy exception when listing users on recent jenkins versions

The approach to retrieving a "plain text" of the API token may be
completely broken by recent core changes but should still be working for
"legacy" api tokens.  However, this is enough to prevent userToMap()
from generating an exception.

allow puppetlabs/stdlib 5.x

Allow custom location for slave JAVA command

Fix small typo in jenkins-slave-defaults.erb

modulesync 1.9.3

Current codebase simply doesn't work with Puppet5. Fixing it is out
of scope for a modulesync.

partial modulesync: switch to Gemfile/Rakefile from modulesync1.9.3

partial modulsync 1.9.2

partial modulesync 1.9.2