adding configuration group support

support for updating an instances config group and dynamically applying updates
removed the duplicate config option
add the etc/trove/validation-rules.json for integers/boolean/string variables
created an overrides template for mysql
added tests to verify the configuration is applied to the instance correctly
removed the special cases from the validation list

Change-Id: I99b0bfe51c131ace30774e75e30d620101ed2e0b