Fix config reader

Can't assume that schema in hdfs-core file will always be there.

Change-Id: I3b9a270b1c2ddda3adec5aa217ef4ac5786157d2
Merge pull request #41 from ravwojdyla/config_read

Skip schema check.
Bump to 2.2.1

Change-Id: I8d4694fdf8c9d251b9f39b2f160c833a9ab031ef