rest: Add GetChainman function and use it

This is not the cleanest change but:

1. It fixes the erroneous use of RPC's Ensure*() in rest.cpp, which
   cause crashes in REST contexts.

   RPC code wraps all calls in a try/except, REST code does not.
   Ensure*(), being part of RPC, expects that its throw's will get
   caught by a try/except. But if you use Ensure*() in REST code, since
   it doesn't have a try/except wrap, a crash will happen.

2. It is consistent with other functions like GetMemPool.

Someone can probably make this a bit prettier.

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