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.

In addition to this, this moves the following fields from
the `baseline` ping payload to the new `client_info`, thus
sending them with all the outgoing pings: "os", "os_version",
"device_manufacturer", "device_model", "architecture". Fields
"locale" and "duration" are retained in the `baseline` ping
payload. See bug 1528787 for more context.

Please note that this additionally changes the internal storage
name for internal metrics, thus resetting its content (e.g. client id,
first run date).

Adds glean timing distribution metric, including it's storage engine, documentation, and unit tests.

verifier plugin.

This change is required to support applications with different
application ids in different variants. In these cases, glean
would have generated a metric API in the `$appId1.GleanMetrics`
namespace, breaking building other variants that tried to import
the API from the variant using, for example, `$appid2`.

For example, for Fenix, Glean is generating code into the
package `org.mozilla.fenix.debug.GleanMetrics`, rather than
`org.mozilla.fenix.GleanMetrics`, which means code would need
to import glean different depending on whether it's in a
debug or release build.