README: add dpkg and info on output dirs
README: add dpkg and info on output dirs

add dpkg instructions

christopherjwang/rackspace-monitoring-agent,virgo-agent-toolkit/rackspace-monitoring-agent,virgo-agent-toolkit/rackspace-monitoring-agent,cp16net/virgo-base,cp16net/virgo-base,AlphaStaxLLC/rackspace-monitoring-agent,cp16net/virgo-base,cp16net/virgo-base,AlphaStaxLLC/rackspace-monitoring-agent,cp16net/virgo-base,kaustavha/rackspace-monitoring-agent,christopherjwang/rackspace-monitoring-agent,kaustavha/rackspace-monitoring-agent