Werk #343: postgres_sessions: make agent plugin compatible with PostgreSQL 9.2

Component	Checks & agents
Title	postgres_sessions: make agent plugin compatible with PostgreSQL 9.2
Date	Dec 16, 2013
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Problem is that newer PostgreSQL versions have the column query instead of current_query. The plugin now simply tries both variants.

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