Refactor frontend element as class
Move counting into separate function
Add fork_in_bg utility function
Use fork_in_bg with counting in glideinFrontendElement
Use fork_in_bg on condor status subprocess
Fix missing reference to glidein_dict instance data
Use fork_in_bg on condor_q subprocess
Use fork_in_bg on query_entries subprocess
3904: Fix FE not forking when querying the factory globals

I took fa3607b7 and changed it to use fork_in_bg.
3967: Move fork_in_bg to utility library