OAK-2051 - Provide option to use Configuration SPI in JAAS authentication when running within AppServer

Modifying LoginContextProviderImpl to use SPI based Configuration API to fetch JAAS Configuration

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1620512 13f79535-47bb-0310-9956-ffa450edef68
OAK-2051 - Provide option to use Configuration SPI in JAAS authentication when running within AppServer

Adding the testcase

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1620513 13f79535-47bb-0310-9956-ffa450edef68