add pom.xml so to deploy the libcephfs to maven repository.
to build a jar, version=0.80-rc1-2008-gf71c889 mvn package -Dversioin=;
and mvn deploy command will deploy the jar to maven central

Signed-off-by: rootfs <hchen@redhat.com>
update license for libcephfs

Signed-off-by: rootfs <hchen@redhat.com>
Merge pull request #2294 from rootfs/wip-java-pom

add pom.xml so to deploy the libcephfs to maven repository.

Reviewed-by: Noah Watkins <noahwatkins@gmail.com>
Reviewed-by: Greg Farnum <greg@inktank.com>