[cmake-developers] Server handshake with only build directory

[Isaiah Norton]

I'd like to use cmake server with only a build directory argument (mostly
in order to query the cache), but receive an error in return:

```
> cmake --version
cmake version 3.9.4

> cmake -E server --experimental --debug

> [== "CMake Server" ==[
> {"cookie":"zimtstern","type":"handshake","protocolVersion":{"major":1},
> "buildDirectory":"/opt/bld/s5nj/Slicer-build"
> }
> ]== "CMake Server" ==]

[== "CMake Server" ==[
{"cookie":"zimtstern","errorMessage":"Failed to activate protocol version:
\"CMAKE_HOME_DIRECTORY\" is set but incompatible with configured source
directory value.","inReplyTo":"handshake","type":"error"}
]== "CMake Server" ==]
```

The docs example with source and generator arguments works -- but shouldn't
the build directory fully determine these options for an already-configured
build tree?

Thanks,
Isaiah
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