Livestatus.query: use write() instead of raw_query

Livestatus.query() used to call raw_query() internally
thus LivestatusQuery() was being invoked twice for each
query.

This was not a problem until pull request #186 which added
extra line break after every query and the operation was not
idempotent.
LivestatusQuery: Remove 'prettifying' of queries.

Previous patch allowed users of LivestatusQuery() to
input queries that had extra line breaks in them and fixed
the queries implicitly by removing extra newlines from the query.

This patch is not needed anymore after
5f242f04ad95a1a7be12d5f90737fff985e8873e so removing it.
Merge pull request #203 from pynag/gst-enh_livestatus_query

Gst enh livestatus query