Aggregate standalone extract scripts into single framework

[fsweetser]

Currently all extract scripts run as separate standalone programs. While this makes adding in new extract scripts more straightforward, the lack of visibility between them leaves some deficiencies:

• It is not possible to ensure a consistent view of the database for all extract scripts in a given run. Machines may be added to DNS, but left of out DHCP until the next run.
• More calls to ssh/rsync than are necessary, as each script may cause its own file transfers and scripted actions. Bundling these together would allow for somewhat more efficient runs.
• Lack of introspection means it is not possible to view or manipulate the status of the individual extract scripts without per-script code in webint. A good framework would allow webint to query for all installed extract modules and their state.
• Addition of new scripts must be reflected in high level script management code.

For a good idea of what such a framework might look like, take a look at how the capture/collect modules are laid out in NetMon.