This additionally improves the logging of
the PingStorageEngine in order to make problems
easier to debug.

If this isn't the first run, it looks for the two user-lifetime metrics in
the old location of `glean_ping_info` and copies them to `glean_client_info`.
It is not problematic that the old values remain in `glean_ping_info`, since
the contents of `ping_info` are hard-coded and don't include these values.

Co-authored-by: Christian Sadilek <christian.sadilek@gmail.com>

This adds the Android specific field `android_sdk_version`
to the glean pings' `client_info` section. It contains the
SDK level of the software running on the hardware, which
was previously reported by `os_version`. The `os_version`
field now matches what `Build.VERSION.RELEASE` reports,
which us a user friendly version number, e.g. "1.2.3".

This PR makes it a bit easier to check what's going on
after a ping is generated: logs are now printing the
submission URL.

-Validate pingTag using regex pattern matching
-Add config item to hold pingTag
-Update uploader to add header with pingTag
-Add server redirect to GCP endpoint for tagged pings
-Add documentation on how to use ping tagging
-Update unit tests to cover ping tagging functionality

Michael Droettboom authored Mar 26, 2019 and travis79 committed Mar 26, 2019

This reverts commit 8bcce763.

Michael Droettboom authored Mar 26, 2019 and travis79 committed Mar 26, 2019

This reverts commit 585cf2b1.