database/sql/driver: rename ResetSessioner to SessionResetter

Originally we tried the strict -er suffix as the rule in this case
but eventually we decided it was too awkward: io.WriteByter
became io.ByteWriter. By analogy, here the interface should be
named SessionResetter instead of the awkward ResetSessioner.

This change should not affect any drivers that have already
implemented the interface, because the method name is not changing.

(This was added during the Go 1.10 cycle and has not been
released yet, so we can change it.)

Change-Id: Ie50e4e090d3811f85965da9da37d966e9f45e79d
Reviewed-on: https://go-review.googlesource.com/78127
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Daniel Theophanes <kardianos@gmail.com>

src/database/sql/driver/driver.go

@@ -222,9 +222,9 @@ type ConnBeginTx interface {
 	BeginTx(ctx context.Context, opts TxOptions) (Tx, error)
 }
 
-// ResetSessioner may be implemented by Conn to allow drivers to reset the
+// SessionResetter may be implemented by Conn to allow drivers to reset the
 // session state associated with the connection and to signal a bad connection.
-type ResetSessioner interface {
+type SessionResetter interface {
 	// ResetSession is called while a connection is in the connection
 	// pool. No queries will run on this connection until this method returns.
 	//

src/database/sql/sql.go

@@ -431,7 +431,7 @@ func (dc *driverConn) resetSession(ctx context.Context) {
 	if dc.closed {    // Check if the database has been closed.
 		return
 	}
-	dc.lastErr = dc.ci.(driver.ResetSessioner).ResetSession(ctx)
+	dc.lastErr = dc.ci.(driver.SessionResetter).ResetSession(ctx)
 }
 
 // the dc.db's Mutex is held.
@@ -1178,7 +1178,7 @@ func (db *DB) putConn(dc *driverConn, err error, resetSession bool) {
 		resetSession = false
 	}
 	if resetSession {
-		if _, resetSession = dc.ci.(driver.ResetSessioner); resetSession {
+		if _, resetSession = dc.ci.(driver.SessionResetter); resetSession {
 			// Lock the driverConn here so it isn't released until
 			// the connection is reset.
 			// The lock must be taken before the connection is put into