npgsql - Npgsql2: [#1010997] Consider using System.Threading.Timer

Log Message:
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[#1010997] Consider using System.Threading.Timer instead of System.Timers.Timer
Thanks Alex A Ermoshenko for feedback, patch and tests.

Modified Files:
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Npgsql2/src/Npgsql:
NpgsqlConnectorPool.cs (r1.15 -> r1.16)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlConnectorPool.cs?r1=1.15&r2=1.16)