(maint) Enable puppet master debug logging if --debug flag is passed

Normally, the puppet master has minimal logging enabled by
default. However, it is beneficial to have additional logging
information to help track down issues during testing. This patch
enables full puppet master logging when the user requests verbose
output at the harness level.
Merge pull request #379 from branan/master_debug_log

(maint) Enable puppet master debug logging if --debug flag is passed