streamline docker build flow and image caching #270
Merged
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#260
this PR removes/starts to remove a bunch of the stuff that has built up around the docker build flow for synse-server. notably, the emulator plugin install stage is now cached by virtue of pinning it to a particular version.
This also fixes a bug that was hidden in image builds before where the packages installed via the frozen requirements.txt were being overridden with latest versions of things when synse-server was installed. Now, we are sure to use the dependency versions that are pinned in requirements.txt
Temporarily, the protobuf dependency was added; this will become a dependency of synse_grpc for the newest release so it can be removed once we update synse_grpc, but until then we need to specify it here.