stop generating openstack lucid stemcell; instead generate trusty
stopped generating aws ruby-agent stemcells

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
remove bosh_agent

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
make sure we know if firstboot.sh overwrites resolv.conf

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>