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

applied Tim's fake_mode fix to the bin/trove-api

Change-Id: I99b0bfe51c131ace30774e75e30d620101ed2e0b