Adding arm64 job in Travis-ci

[odidev]

Adding arm64 job in Travis-ci

[odidev]

I have switched to focal in order to use arm64-graviton but in focal docker-containerd is not using port 10010. As after docker-ce_18.06.0~ce~3-0~ubuntu version, by default containerd is not running in port 10010. So for now, I have commented the check_port function.

I have also done a few changes like -

• Installed criu from the source as it is not available for focal using apt-get.

• For nsenter it is already present in focal so just copied to the desired location.

• Upgraded KUBERNETES_VERSION to "v1.18.10".

• Installed various binaries for arm64 and also put the checks to pick the correct image and its tag.

• Skipped some of the test cases which were failing for arm64 as the test cases were using busyboxImage 1.25 and this is not available for arm64.

• Did some changes in “alibaba/cri-tools” repository in order to resolve the test cases that were failing for “CRIv1alpha2 test” job.
  Link - pheobe12/cri-tools@abd4867

For the changes and the job issues please refer to the below commit and Travis link.
Commit Link- pheobe12@f518225
Travis Link- https://travis-ci.com/github/pheobe12/pouch/builds/204896892

After these changes there are jobs that are failing for arm64 as well as amd64 and docker-containerd is not running in port 10010. Can you please provide any pointers on them?