Remove obsolete htools/Makefile
Remove obsolete htools/Makefile

Only one target wasn't ported over (the TAGS one), as hasktags is not
available easily in distributions, so it doesn't make sense to enable
it for all developers.

Signed-off-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>
Reviewed-by: Michael Hanselmann <68b67885ff74281219b4a4be33cc20fd45078d7c@google.com>

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