[FLINK-17374] Remove travis-related files

[rmetzger]

What is the purpose of the change

Disable build processing on travis-ci.

Brief change log

• removed .travis.yml
• removed files only needed for processing CI builds on travis

I will open one or more additional pull requests cleaning up the codebase as described in FLINK-17375.

[rmetzger]

Note: one commit message is off [FLINK-17374][travis] Remove travis-related files], I will fix this with the first round of review of before merging.

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Last check on commit 14cfe31 (Mon Apr 27 11:54:18 UTC 2020)

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CI report:

• 14cfe31 Azure: FAILURE

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[zentol]

Do you want to remove all travis reference in this PR, or are you content with just removing files?

[zentol]

tools/log4j-travis.properties could also be renamed

[zentol]

any reason why this is still called travis_watchdog.sh?

[rmetzger]

Reported unstable test from CI run: https://issues.apache.org/jira/browse/FLINK-17463

[rmetzger]

I don't know if it is a good idea or not, but I wanted to do a first quick PR to disable travis, and then do a bigger PR where I split things like travis_watchdog.sh into different utility files.

There are so many mentions of "travis" throughout the code, that this would require a much bigger change, and I didn't want to obfuscate this PR too much. FLINK-17375 is for tracking the cleanup work.

[zentol]

I think it is a good idea too, was just wondering since you are also renaming that one directory.

But it appears we didn't break anything, so +1.