Use the newest versions of the build tools.

These should allow to run the tests on SL5.
Detect errors in scriplet executions to fix #42
Fix spurious warnings.

If we pass an undefined stdin to the CAF::Process the reporting logic
will raise warnigns about uninitialised values.
Validate the SSHD configurations.

If the configuration is invalid we discard the file and don't
restart (i.e, bring down) the daemon.

Fix #43.
Merge pull request #45 from piojo/spma-diagnose-errors

Better diagnostics of Yum errors
Merge pull request #30 from piojo/build-tools

Bump the build tools used.
Merge pull request #46 from piojo/sshd-validate

Validate the SSHD configurations.
Move ncm-ganglia from stratuslab to configuration-modules-cores
Move ncm-libvirtd from stratuslab to configuration-modules-core
Keep users and accounts for the DHCP daemons.
Merge pull request #54 from piojo/keep-dhcp

Keep users and groups for DHCP daemons