PERF-313: Added rspec for isc_dhcp module class.
PERF-313: Added a params class.
PERF-313: Added spec context for when ddns-update-style is not none.
PERF-313: Added in rspec for isc_dhcp::host defined type.
Merge pull request #6 from pdzwart-atlassian/master

Added rspec for isc_dhcp module class.