Refactor OgQMP and adapt operations

This patch:
- Fixes logic errors in the communication with QMP (the order of handshake
  messages was not right).
- Rewrite parts of OgQMP class.
- Enforces better coding practices by using Python's "context managers" to avoid
  forgeting an open socket in case exceptions occur.
- Adapt virtual operations to the use of "context managers" using the "with"
  statement.

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