BIGTOP-1031: README has outdated/ambiguous information

Signed-off-by: Mark Grover <mark@apache.org>
BIGTOP-938. Bigtop currently uses Junit 4.8.2, would be useful to upgrade to the latest one that is Junit 4.11.
BIGTOP-938. Bigtop currently uses Junit 4.8.2, would be useful to upgrade to the latest one that is Junit 4.11.

    I have messed up the patch - I have no idea how I could messed up 3 letters patch.
    Fixed.
BIGTOP-1034: Custom user's home directory's creation fails in init-hdfs.sh

Signed-off-by: Mark Grover <mark@apache.org>
BIGTOP-715. Add Spark packaging

Adding Spark packaging, system services, etc. The bits are taken from the current HEAD of
the project's git master
BIGTOP-1037. Provide a mechanism to control the sourcing of defaults files
BIGTOP-1051. Spark archive should come in tar.gz format