BEF can hang during Eclipse workspace re-open due to Bazel command hang

[plaird]

Sometimes BEF will hang on re-open of an existing workspace because a Bazel command never returns.

        int exitCode = process.waitFor();

https://github.com/salesforce/bazel-eclipse/blob/master/plugin-libs/plugin-command/src/main/java/com/salesforce/bazel/eclipse/command/shell/ShellCommand.java#L129

Bazel commands are single threaded. Only one command can run at a time. Perhaps a command is stuck, and so the whole thing halts. We should be specifying a timeout into the waitFor() invocation. But that timeout needs to be configurable because whatever value we pick probably won't work for some huge package.

https://stackoverflow.com/questions/5483830/process-waitfor-never-returns

[plaird]

I can no longer reproduce this. We have done some optimizations of the import/classpath code, perhaps we fixed this without knowing it.