Move make_identifier function to collect.py #1007

Job	Run time
bugwarrior-development-pip-test	1m 4s
bugwarrior-test (3.11)	38s
bugwarrior-test (3.12)	59s
bugwarrior-test (3.10)	36s
bugwarrior-test (3.14)	37s
bugwarrior-multiarch-test (ppc64le)	6m 36s
bugwarrior-test (3.13)	38s
	11m 8s

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