build: compile examples and cephfs targets

Signed-off-by: Joe Buck <jbbuck@gmail.com>
fabfile.py:  Add gnupg and expect to rpm package list.

These two packages are needed for signing rpms.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
rpm-autosign.exp:  New utility to help sign rpms.

The rpm commend insists on prompting for a passphrase when signing rpms even
for passphraselees keys.  This behaviour causes problems for automated build
scripts.  The rpm-autosign.exp scripts is a small expect wrapper for rpm that
that sends empty passphrase in reposne to the prompt.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
build-ceph-rpm.sh:  Sign rpms

Use the rpm-autosign.exp expect wrapper to handle the prompt
for the passphrase.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
autobuild: adding Apache Hadoop gitbuilder

This gitbuilder will package up select
branches from Apache's Hadoop repo.

Signed-off-by: Joe Buck <jbbuck@gmail.com>
Reviewed-by:  Gary Lowell  <gary.lowell@inktank.com>