Added additional finder methods for region and country

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.1.0 CE GA1, 6.1.10 EE GA1, 6.2.0 CE M2
• Fix Version/s: 6.1.20 EE GA2, --Sprint 11/12, 6.2.0 CE M2
• Component/s: ~ [Archived] Frontend Infrastructure
• Labels: None
• Branch Version/s:
  6.1.x
• Backported to Branch:
  Committed
• Git Pull Request: https://github.com/wesleygong/liferay-portal/pull/6

Added fetch method for region based on countryId and regionCode. Also added fetch method for country based on the three character abbreviation of that country.

RegionServiceUtil.fetchRegionByRegionCode(long countryId, String regionCode)
CountryServiceUtil.fetchCountryByA3(String a3)