Add log4j-web jar to core and serving

[Yanson]

What this PR does / why we need it:

When starting serving or core (with info level logs) the following warning shows up:

2020-02-26 17:38:47,600 restartedMain INFO Log4j appears to be running in a Servlet environment, but there's no log4j-web module available. If you want better web container support, please add the log4j-web JAR to your web archive or server lib directory.

This PR adds the log4j-web jar as requested by this message. I don't believe there are any other implications, it is just to omit the warning.

Given the jar is ~30K I think this is harmless.

Which issue(s) this PR fixes:

n/a

Does this PR introduce a user-facing change?:

NONE

[feast-ci-bot]

Hi @Yanson. Thanks for your PR.

I'm waiting for a gojek member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Yanson]

/assign @thirteen37

[woop]

/ok-to-test

[woop]

/lgtm

[woop]

/approve

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: woop, Yanson

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