simplify key_list #1006

Job	Run time
bugwarrior-development-pip-test	52s
bugwarrior-multiarch-test (ppc64le)	7m 6s
bugwarrior-test (3.13)	34s
bugwarrior-test (3.11)	37s
bugwarrior-test (3.12)	38s
bugwarrior-test (3.10)	41s
bugwarrior-test (3.14)	42s
	11m 10s

Provide feedback