spec: spring cleaning
    
    - %_pkgdocdir definition, not needed now
    - define %service_name == postgresql.service
    - remove duplicate help2man br
    - don't try to install perl-generators on RHEL
    - add BR Data::Dumper for perl testsuite
    - use %_localstatedir for several /var occurrences
    - use %_datadir instead of hard-wiring it
    - don't install *.o tutorial files (rhbz#1187514)
    - use mv instead of cp for rhbz#1250006 work-around
    - run 'make check' for postgresql-setup tarball
    
    Resolves: rhbz#1440729
    Version: 9.6.2-3