Fixes #11673 - accept integer value when setting the integer via API

Fixes #7167 - names of settings marked for translation

Fixes #10402: add to_bool function for converting to boolean.

This commit adds a to_bool function for casting values to boolean
as well as an example usage.

http://projects.theforeman.org/issues/10402

Fixes #9613 - foreman_url can't be blank

Fixes #5649 - unattended_url validation fix

fixes #10343 - only log cache deletion failures when saving settings

Fixes #8566 - reorganized settings categories

Refs #3809 - Remove cop IndentationConsistency

Refs #3809 - Remove cops for empty lines

Refs #3809 - Enable cop StringConversionInInterpolation

Refs #3809 - Remove useless assignments

Refs #3809 - Use parentheses in method definitions

Refs #3809 - Fix a few rubocop TODOs

Fixes #6874: Integers in settings can be up to 8 digits to avoid bigint out of range error

refs #3569 - fix URL validation test error on merge

Fixes #3569, #3210 - Use port from foreman_url for templates

fixes #2756 - update setting descriptions at startup

fixes #3089 - Updating settings causes settings page to load again within the page

fixes #2764 - settings defined in settings.yaml file are now read-only

fixes #2660 - settings, improve tests and fixes

- added string settings type
- fixed tests previously commented out due to CI failures
- more tests for core settings functionality
- parsing of string values enhanced and extracted to a separate method
- setting value to nil when it equals default is back...

fixes #2153 - add trusted_puppetmaster_hosts setting to permit puppetmaster access

Connections to fact + report upload and externalNodes will be permitted from
any host listed in the trusted_puppetmaster_hosts setting, bypassing the
requirement for a registered smart proxy....

Rails cache returns incorrect value for false values.

while this is fixed in Rails 3.1.4, a work around is required for now:

Settings getter method correctly returns false instead of nil.

fixes #1888 - set value to default if zero or less

• idle_timeout
• entries_per_page
• puppet_interval

[SQL optimizations] - many small optimizations

• Bookmarks have only users, not usergroups
• added caching to the settings table
• removed notice message lookups (we are not really using those)...

removed failing tests in travis

WIP rails3 migration

fixes #100 - Setting is now a ActiveRecord object

This allows users to manage foreman settings via the UI.

the UI is a bit ugly, but works :)