[cdc_stream] Add a CLI client to start/stop asset streaming sessions (#4)

Implements the cdc_stream client and adjusts asset streaming in
various places to work better outside of a GGP environment.

This CL tries to get quoting for SSH commands right. It also brings
back the ability to start a streaming session from
asset_stream_manager.

Also cleans up Bazel targets setup. Since the sln file is now in root,
it is no longer necessary to prepend ../ to relative filenames to
make clicking on errors work.

tests_common/tests_common.vcxproj

@@ -62,7 +62,6 @@
     <BazelTargets>//tests_common</BazelTargets>
     <BazelOutputFile>tests_common.exe</BazelOutputFile>
     <BazelIncludePaths>..\;..\third_party\absl;..\third_party\jsoncpp\include;..\third_party\blake3\c;..\third_party\googletest\googletest\include;..\third_party\protobuf\src;..\third_party\grpc\include;..\bazel-out\x64_windows-dbg\bin;$(VC_IncludePath);$(WindowsSDK_IncludePath)</BazelIncludePaths>
-    <BazelSourcePathPrefix>..\/</BazelSourcePathPrefix>
   </PropertyGroup>
   <Import Project="..\NMakeBazelProject.targets" />
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />