Regenerate androidmanagement client

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Commits in this repo since last synth:

Log from Synthtool

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/synth.py.
On branch autosynth-androidmanagement
nothing to commit, working tree clean
HEAD detached at FETCH_HEAD
nothing to commit, working tree clean
synthtool > Cloning https://github.com/googleapis/discovery-artifact-manager.git.
synthtool > Cleaning output directory.
synthtool > Installing dependencies.
synthtool > Generating androidmanagement v1.
synthtool > 	1.30.1
WARNING:root:object without properties Empty: OrderedDict([(u'description', u'A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance:\nservice Foo {\n  rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);\n}\nThe JSON representation for Empty is empty JSON object {}.'), (u'type', u'object'), (u'properties', OrderedDict()), (u'id', u'Empty')])
Writing json metadata to clients/google-api-services-androidmanagement/v1.metadata.json
synthtool > Wrote metadata to clients/google-api-services-androidmanagement/synth.metadata.