Patch to fix search_path defencies with pg_bench

Hello,

I have been doing some testing with pgbench and I realized that it
forces the use of public as its search_path. This is bad if:

* You want to run multiple pgbench instances within the same database
* You don't want to use public (for whatever reason)

This patch removes that ability and thus will defer to the default
search_path for the connecting user.

diff --git a/contrib/pgbench/pgbench.c b/contrib/pgbench/pgbench.c
index ad20cac..1f25921 100644
--- a/contrib/pgbench/pgbench.c
+++ b/contrib/pgbench/pgbench.c
@@ -357,8 +357,6 @@ doConnect(void)               return NULL;       }
-       executeStatement(conn, "SET search_path = public");
-       return conn;}

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