Fix OSGi version identifier.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1602781 13f79535-47bb-0310-9956-ffa450edef68
Fix OSGi API artifact name.

  - OSGi artifacts are usually named after their bundle identifiers. 
  See for example every artifact by Eclipse.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1602782 13f79535-47bb-0310-9956-ffa450edef68
Add OSGi API as provided dependency in log4j-api.

  - Being OSGi, this only affects OSGi users.
  - Without this dependency, things work as usual (so this JAR still 
  works on its own).

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1602783 13f79535-47bb-0310-9956-ffa450edef68
Add changelog message for LOG4J2-619.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1602785 13f79535-47bb-0310-9956-ffa450edef68