Freeze mutable objects assigned to constants

Freeze mutable objects assigned to constants

Fixes cookstyle complaint:

Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.
Inspecting 597 files
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Offenses:

cookbooks/db/recipes/master.rb:87:22: C: [Correctable] Style/MutableConstant: Freeze mutable objects assigned to constants.
CGIMAP_PERMISSIONS = { ...
                     ^
cookbooks/db/recipes/master.rb:122:26: C: [Correctable] Style/MutableConstant: Freeze mutable objects assigned to constants.
PLANETDUMP_PERMISSIONS = { ...
                         ^
cookbooks/db/recipes/master.rb:128:26: C: [Correctable] Style/MutableConstant: Freeze mutable objects assigned to constants.
PLANETDIFF_PERMISSIONS = { ...
                         ^

597 files inspected, 3 offenses detected, 3 offenses auto-correctable