Makefile: Add rpm target
Makefile: Add rpm target

Also include spec files in EXTRA_DIST list. With this last change it is now
possible to build the rpm package by typing 'make rpm'.

Signed-off-by: Eduardo Lima (Etrunko) <62d34c03f1c79cee129ea3245d580303ab09f27f@br.ibm.com>

joehandzik/libstoragemgmt,joehandzik/libstoragemgmt,libstorage/libstoragemgmt,jumitche/libstoragemgmt,jumitche/libstoragemgmt,libstorage/libstoragemgmt,cathay4t/libstoragemgmt,cathay4t/libstoragemgmt,tasleson/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,lazy404/libstoragemgmt,jumitche/libstoragemgmt,libstorage/libstoragemgmt,joehandzik/libstoragemgmt,cathay4t/libstoragemgmt,libstorage/libstoragemgmt,libstorage/libstoragemgmt,tasleson/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,lazy404/libstoragemgmt,cathay4t/libstoragemgmt,tasleson/libstoragemgmt,cathay4t/libstoragemgmt,tasleson/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,joehandzik/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,jumitche/libstoragemgmt,lazy404/libstoragemgmt,lazy404/libstoragemgmt,tasleson/libstoragemgmt,jumitche/libstoragemgmt