Refactor python tests to run against python3.9

[jwhonce]

• Introduce sub-package compat to meet packaging and import requirements
• Update documenation for running tests
• Add requirements.txt to improve IDE support

Signed-off-by: Jhon Honce [email protected]

[openshift-ci-robot]

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[rhatdan]

LGTM

[baude]

/hold

[baude]

/lgtm

[baude]

/hold cancel

[edsantiago]

Timing comparison:

type	distro	user	local	remote	container
int	fedora-33	root	33:54	39:55	31:38
int	ubuntu-2004	root	44:44	01:10:12
int	ubuntu-2010	root	41:04	46:28
int	fedora-33	rootless	34:26
sys	fedora-33	root	18:33	13:09
sys	ubuntu-2004	root	25:24	32:09
sys	ubuntu-2010	root	24:38	18:13
sys	fedora-33	rootless	15:56

[edsantiago]

I extended my timing-compare script to handle system tests. Results for podman-remote tests are interesting. Boldface indicates a number that is more than 50% off from a different result. Only results over 5 seconds are listed, anything less than that is ignored. @baude @vrothberg PTAL

	fedora 33	ubuntu 2004	ubuntu 2010
20 podman run - basic tests	3.00	5.00	5.00
33 podman run --log-driver	4.00	9.00	5.00
48 podman ps --filter	2.00	7.00	4.00
51 podman stop --all	5.00	9.00	6.00
53 podman stop - can trap signal	5.00	9.00	6.00
65 podman cp file from host to container	19.00	76.00	26.00
66 podman cp file from container to host	15.00	95.00	25.00
67 podman cp dir from host to container	17.00	142.00	35.00
68 podman cp dir from container to host	14.00	107.00	28.00
69 podman cp file from host to container volume	1.00	34.00	6.00
70 podman cp file from host to container mount	2.00	29.00	6.00
71 podman cp * - wildcard copy multiple files from container to host	1.00	18.00	5.00
72 podman cp - will not recognize symlink pointing into host space	1.00	14.00	5.00
73 podman cp - will not expand globs in host space (#3829)	1.00	13.00	4.00
74 podman cp - will not expand wildcard	1.00	13.00	5.00
75 podman cp into container: weird symlink expansion	3.00	28.00	13.00
76 podman cp into a subdirectory matching GraphRoot	3.00	22.00	8.00
77 podman cp from stdin to container	13.00	41.00	24.00
78 podman cp from container to stdout	12.00	38.00	21.00
79 podman build - basic test	5.00	35.00	15.00
82 podman build - cache (#3920)	4.00	24.00	11.00
83 podman build - URLs	2.00	15.00	6.00
84 podman build - workdir, cmd, env, label	17.00	129.00	58.00
85 podman build - stdin test	4.00	17.00	14.00
86 podman build - does not gobble stdin that does not belong to it	2.00	7.00	7.00
87 podman build --layers test	6.00	13.00	16.00
88 build with copy-from referencing the base image	12.00	18.00	21.00
99 podman load - by image ID	2.00	5.00	6.00
100 podman load - by image name	3.00	6.00	6.00
102 podman load - multi-image archive	4.00	8.00	7.00
103 podman load - multi-image archive with redirect	4.00	8.00	7.00
105 podman kill - rejects invalid args	2.00	6.00	6.00
120 podman volume: exec/noexec	2.00	5.00	5.00
121 podman volume, implicit creation with run	4.00	7.00	6.00
123 podman volume prune	3.00	7.00	6.00
125 podman pod - communicating between pods	3.00	8.00	7.00
126 podman pod - communicating via /dev/shm	2.00	6.00	6.00
135 podman system df - with active containers and volumes	3.00	5.00	5.00
153 podman shell completion test	65.00	201.00	142.00