Update the read from statementCache to be sensitive to the parameter OID
values requested by the client. That is, sending the same statement text
with different parameter values results in a different statement in the
cache.
Reduce the severity of the parameter check for rejecting cached
statements.
Update the CacheIT to include some prepared statement processing
merge tjoneslo: Update the read from statementCache to be sensitive to the parameters

Merge pull request #1038 from tjoneslo/sql-layer/postgresql-statement-cache-parameters
https://github.com/FoundationDB/sql-layer/pull/1038