re-generate rtdb's api.txt and fail build if an error occurs parsing the file

[thatfiredev]

The api.txt file should have been regenerated in #1672, but the build failed silently with a warning:

Unable to parse signature file /home/prow/go/src/github.com/firebase/firebase-android-sdk/firebase-database/api.txt:

 /home/prow/go/src/github.com/firebase/firebase-android-sdk/firebase-database/api.txt:191:

 expected ; found (

This PR should:

• unset setIgnoreExitValue(true) to prevent the build from failing silently;
• regenerate the firebase-database's api.txt file.

[google-oss-bot]

Hi @rosariopfernandes. Thanks for your PR.

I'm waiting for a firebase 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[samtstern]

@rosariopfernandes didn't realize you were already working on this! No need to base this on my PR, you can base this on master. This change is good.

You can just copy the @hide comment from #1690 (just pushed it)

[thatfiredev]

@samtstern Seems like I was also seeing an outdated thread and I only saw the recent comments when I posted mine.

I'll base this on master and add the @hide comment

[samtstern]

Just gonna have @rlazo double-check this because I am not a normal SDK approver, although this LGTM!

[rlazo]

Done, thanks!