TLS Config Store makes calls to Fake S2A Service

[rmehta19]

In this PR:
-TLS Config Store modified to call S2Av2 for Client TLS Configuration and Server TLS Configuration.
-Test suite modified to start / stop fake S2Av2 Server on port 8008.
-Cleaned up some error messages to be more clear.
-Removed fakes2av2_server binary(accidentally added through running go build in previous PR)

[matthewstevenson88]

Hey Riya! I did a quick first pass. PTAL. :)

[rmehta19]

Thanks for the comments Matt!

[matthewstevenson88]

Thanks Riya! Here's another batch of comments. :)

[rmehta19]

Testing s2av2 with Logging

bazel run server (running go Echo server)

bazel run fakes2av2_server

bazel run client

[rmehta19]

Also, to summarize what ports are being used :

8080 for the go echo server
8008 for the fakes2av2 server
all the unit tests that start up fakes2av2 use :0 for the port

[rmehta19]

Testing s2av2 "without" Logging(retained the minimal amount of logging in the testonly code pre-This PR)

bazel run server (running go Echo server):

bazel run fakes2av2_server:

bazel run client:

[rmehta19]

Thanks for all the comments Matt! I made the changes and also started everything up again to verify it all works

[matthewstevenson88]

LGTM with a couple minor comments. Thanks for the great PR Riya! This PR was probably the most complex part of the whole project, so really great work getting it done.

[rmehta19]

Thanks Matt! I really appreciate all the helpful comments :)