Improving jobs reliability

[nuclearcat]

After analysis of Jenkins job runs we are able to identify few weak spots where job might fail early, while it is still possible to recover and continue.
This patches are addressing this, as attempt to improve job execution success rate.

Fixes #1451
Fixes kernelci/kernelci-project#124
Fixes #1461
Fixes #1462

[nuclearcat]

build.py: Add retry to _download_file works

+ cd /scratch
+ set +x
+ kci_build pull_tarball --url http://storage.staging.kernelci.org/kernelci/staging-next/staging-next-20221005.0/linux-src_kernelci_staging-next.tar.gz --retries 3 --delete
_download_file exception HTTPConnectionPool(host='storage.staging.kernelci.org', port=80): Max retries exceeded with url: /kernelci/staging-next/staging-next-20221005.0/linux-src_kernelci_staging-next.tar.gz (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fbad9b0a5e0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')), might retry
_download_file exception HTTPConnectionPool(host='storage.staging.kernelci.org', port=80): Max retries exceeded with url: /kernelci/staging-next/staging-next-20221005.0/linux-src_kernelci_staging-next.tar.gz (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fbad9b0a0d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')), might retry
+ kci_build generate_fragments --build-config=kernelci_staging-next
kernel/configs/kselftest.config
kernel/configs/crypto.config

And build was completed successfully.

[mgalka]

Some remarks