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Update use of subject for rspec-puppet 2.0

Allow empty range parameter

When a user would pass an empty range parameter, it would result into

pool {
range ;
}

dhcpd would fail to start after that. With this patch, the whole pool
block is omitted.

Closes GH-29

added ability to configure pool specific name servers.

Closes GH-26

Add the abiltity to specify different pxeservers per dhcp pool