Use DRMAA to interface with different resource management systems

[kozo2]

DRMAA is a specification for executing a job regardless of the type of distributed resource manager.

I will update
https://github.com/ecell/ecell4/blob/master/python/lib/ecell4/extra/sge.py
and
https://github.com/ecell/ecell4/blob/master/python/lib/ecell4/extra/slurm.py
with
https://github.com/pygridtools/drmaa-python

to interface with different resource management systems. (with a unified manner.)