Add new Makefile target to rebuild the whole dist
Add new Makefile target to rebuild the whole dist

Due to the fact how the automake system works it doesn't rebuild already
prebuild files in distcheck. This lead to a bug, where a rebuild of the
documentation was failing because we missed the fact that the files were
missing from the archive.

By adding distrebuildcheck we workaround that issue by running a
maintainer-clean which also removes prebuild files.

Signed-off-by: René Nussbaumer <bc755ac45a0e799d1d490cba76febc56d80cc5fc@google.com>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

andir/ganeti,onponomarev/ganeti,grnet/snf-ganeti,ganeti-github-testing/ganeti-test-1,onponomarev/ganeti,ganeti/ganeti,bitemyapp/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/ganeti,andir/ganeti,yiannist/ganeti,ganeti/ganeti,leshchevds/ganeti,mbakke/ganeti,yiannist/ganeti,leshchevds/ganeti,dimara/ganeti,leshchevds/ganeti,mbakke/ganeti,andir/ganeti,apyrgio/snf-ganeti,ganeti/ganeti,apyrgio/ganeti,dimara/ganeti,bitemyapp/ganeti,apyrgio/snf-ganeti,mbakke/ganeti,yiannist/ganeti,grnet/snf-ganeti