[pgadmin-hackers] PATCH: RM# 1679 - Background process for "restore" not reportingstatus back to pgAdmin

Please find the patch to resolve the issue reported in RM #1679

This will take care of:

- Find the appropriate available Python interpreter to execute the process_executor.py.

  In case of WSGI or Runtime, it was not properly find the interpreter required to execute that script. Also, on windows - we should give priority to the windowless python interpreter (if available).

- Execute the process_executor.py script with proper platform dependent flags to run it as daemon.

- Run the process_executor.py in proper daemon mode. It helps to run the long running processes like backup, restore, etc.

  On windows, run the process_executor.py from process_executor.py in detached mode to allow the child process to run in detached mode.

  On POSIX, fork the process_executor.py to allow the child process to run in daemon mode.

  Also - listen the signal like SIGINT, SIGTERM, so that - the child does not kill, or hangup (It used to happen.

NOTE:

This patch does not take care of the unicode errors in the path. I will send a separate patch for the same.