Profile and domain domconfs not merge currectly

[rayderua]

here is a problem with merging nested hashes using +: they are not merged deeply.

Example:

$h1 = { 'a' => { 'x' => 1, 'y' => 2 }, 'b' => 1 }
$h2 = { 'a' => { 'y' => 99 } }
$h3 = $h1 + $h2
'''
Result:

{ a => { y => 99 }, b => 1 }

As a result, we cannot correctly merge the domain domconf with the profile domconf.
The solution is to use deep_merge() instead.

PR for fix