investigate calling individual crash commands through hotkdump, including passing variables

[nkshirsagar]

Investigate whether its possible using subprocess.Popen() or similar to send a command to crash through hotkdump and get back the output in a python variable, keeping the crash session alive to make further such calls.

This will help move the analysis part of the vmcore out of the generated crash_commands and into the python code itself.

The scripted file can still be used to collect the command outputs generally needed but any specific analysis could take place through hotkdump itself, since that gives us more options and choices of what to do with the returned information, compared to a generated script.