Issue 3716 shorten logging

[argzdev]

Fixes #3716.

Android version 7.0 has a limit of 23 characters when using isLoggable. Since this limit cannot be bypassed or changed, the preferred solution is to shorten the prefix and cap the concatenated string.

The concatenated string with prefix would look like this. Limited at 23 chars.
e.g.

TRuntime.SQLiteEventSto
TRuntime.CctTransportBa
TRuntime.AlarmManagerSc
TRuntime.JobInfoSchedul
TRuntime.Uploader
TRuntime.Executor

[argzdev]

I initially thought of shortening the LOG_TAGs in their respective classes, however this would be messy and multiple classes will be affected. As a result, I've added a method to concatenate the tags with limits instead.

[google-oss-bot]

@argzdev: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
check-changed	50cec71	link	/test check-changed

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[google-oss-bot]

Coverage Report ¹

Affected Products

No changes between base commit (b5de13f) and merge commit (c54abdf).

Test Logs

• Base (b5de13f): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-check-coverage/1525213279817830400
• Merge (c54abdf): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3727/check-coverage-changed/1526143793751920641

Notes

• Commit (c54abdf) is created by Prow via merging PR base commit (b5de13f) and head commit (50cec71).
• Run gradle <product>:checkCoverage to produce HTML coverage reports locally. After gradle commands finished, report files can be found under <product-build-dir>/reports/jacoco/.

1. https://storage.googleapis.com/firebase-sdk-metric-reports/nKv87imIRm.html

[google-oss-bot]

Size Report ¹

Affected Products

• transport-runtime

  Type	Base (b5de13f)	Merge (c54abdf)	Diff
  aar	178 kB	178 kB	+313 B (+0.2%)
  apk (aggressive)	43.9 kB	43.9 kB	+16 B (+0.0%)
  apk (release)	82.7 kB	82.8 kB	+64 B (+0.1%)

Test Logs

• Base (b5de13f): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1525213279817830401
• Merge (c54abdf): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3727/binary-size/1526143793751920646

Notes

• Commit (c54abdf) is created by Prow via merging PR base commit (b5de13f) and head commit (50cec71).

1. https://storage.googleapis.com/firebase-sdk-metric-reports/z90vZHfCNU.html