Fixes #12004, #11999 - Remove reserved words from Environment friendly_id

Restores use of friendly_id, but removes 'new', 'edit' etc from the
reserved words list to ensure they can be used as identifiers.

Reverts the id-name parameterization to purely name, which fixes...

refs #12147 - adding permissions setter to roles

Problem

Calling FactoryGirl.build(:role, :permissions => []) needs a setter
directly on role. Otherwise it fails on Rails 4 with:
ActiveRecord::HasManyThroughNestedAssociationsAreReadonly: Cannot modify...

refs #12147 - adding safety guards to method_missing on compute attributes

There's no need to pass to vm_atts when the method is a setter, also,
there's no need to pass if vm_attrs is blank. Those safety guards are
required in rails4, and compatible with 3.

Fixes #12102 - Adds socket errors catching to rackspace test connection

Without that, the user doesn't get feedback about problems in the connection to the racksapce service, such as invalid server address.

Fixes #11972 - ignore specific interfaces via settings

Fixes #11987 - Check exit code of deployment scripts

This commit fixes checking exit codes returned from provisioning templates, which were ignored
because of sending results through pipe to command tee. Also adds optional host deleting if deployment
fails because of non zero exit code. This can be configured by setting clean_up_failed_deployment...

fixes #12095 - prevent escaping of lookup key default value with ERB

When the current default value is retrieved from a lookup key via
default_value_before_type_cast, do not re-dump values containing ERB as
they will not have been cast already. This prevents them being escaped...

fixes #11881 - Searching for "puppet" in Puppet Classes takes long - Set only_explicit to host and config groups definitions in puppetclasses

Fixes #10988 - Remove 1.11 deprecations

Fixes #12059 - AuthSourceLdap allow_nil should be removed

When we migrated to the new migration syntax, the clause
`validate_length_of :host` was wrongly translated. It contains a clause
`allow_nil` that allows it to be nil, but in Rails 3 the `:presence =>...