barclamp_install.rb new option: --no-rsync

To be used during package build (together with --no-chef, --no-migrations) to
avoid duplicating all the barclamps file into /opt/dell/barclamps/$name.
Note: crowbar.yml is still created in /opt/dell/barclamps/$name, as other tools
expect it to be present there.
barclamp_install: Use barclamp name as destination directory

Instead of using the base name of the source directory as the destination in
/opt/dell/barclamps, use the name that is extracted from crowbar.yml.
seed-barclamp-packages: Dependencies on other barclamps are add at build time nowadays
Packaging: Use barcamp_install to layout files during build

This makes use of the latest additions to barclamp_install.rb (--no-rsync,
...). The spec and _service file templates where also updated to be in better
sync with the latest manual changes to our spec files.
Merge pull request #1685 from rhafer/rhafer-barclamp_install

Additional packaging related changes