DL-59: Check findbugs warning before packaging
DL-59: Check findbugs warning before packaging

check findbugs errors before running package

Author: Khurrum Nasim <khurrumnasimm@gmail.com>

Reviewers: Sijie Guo <sijie@apache.org>

Closes #38 from khurrumnasimm/kn/DL-59

sijie/incubator-distributedlog,sijie/incubator-distributedlog,twitter/distributedlog,sijie/incubator-distributedlog,twitter/distributedlog,twitter/distributedlog,sijie/incubator-distributedlog,twitter/distributedlog,twitter/distributedlog,sijie/incubator-distributedlog