add CNI bridge network provider #1647

Job	Run time
prepare	1s
test / prepare	2m 55s
test / run (containerd, ./frontend/dockerfile, integration)	8m 56s
test / run (containerd, ./frontend/dockerfile, dockerfile)	9m 20s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	6m 29s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	8m 34s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	6m 52s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	9m 0s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	7m 27s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	12m 24s
test / run (oci, ./frontend/dockerfile, integration)	6m 23s
test / run (oci, ./frontend/dockerfile, dockerfile)	11m 5s
test / run (oci-rootless, ./frontend/dockerfile, integration)	7m 39s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	10m 50s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	7m 40s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	11m 19s
image (mainline)	7m 42s
image (labs)	7m 44s
release	0s
	2h 22m 20s

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