cleanup resubmission arguments

[belforte]

it appears that in current code base a list of jobids is always passed from client to server at crab resubmit time.
This should be verified.
And if true we can remove code server side which tries to allow for the jobids to be something different from a list.
E.g.

CRABServer/scripts/dagman/AdjustSites.py

Lines 553 to 559 in be19126

	if 'CRAB_ResubmitList' in ad:
	resubmitJobIds = ad['CRAB_ResubmitList']
	try:
	resubmitJobIds = set(resubmitJobIds)
	resubmitJobIds = [str(i) for i in resubmitJobIds]
	except TypeError:
	resubmitJobIds = True