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This fix tries to fix issues encountered when running a container with a hostname that is longer than HOST_NAME_MAX(64). Previously, `could not synchronise with container process` was generated as the length of the regex check was missing. This fix covers the length check so that a hostname that is longer than HOST_NAME_MAX(64) will be given a correct error message. Several unit tests cases and additional integration test cases are added as well. This fix closes #21445. Signed-off-by: Yong Tang <yong.tang.github@outlook.com>