lib: virgo_lua: move virgo_os to virgo.os
lib: virgo_lua: move virgo_os to virgo.os

create a configuration table called virgo available to the entire
context, put OS in it.

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