Clean up logging bugs.

boulder-ca was redundantly calling SetAuditLogger, leading to a warning message.

NewDbMap was calling GetAuditLogger, which is an anti-pattern, but didn't really
need to log anyhow. So deleted those lines. This cleans up some of the spam that
shows up when a test fails.

cmd/boulder-ca/main.go

@@ -111,8 +111,6 @@ func main() {
 		// AUDIT[ Error Conditions ] 9cc4d537-8534-4970-8665-4b382abe82f3
 		defer auditlogger.AuditPanic()
 
-		blog.SetAuditLogger(auditlogger)
-
 		go cmd.DebugServer(c.CA.DebugAddr)
 
 		var paDbMap *gorp.DbMap

sa/database.go

@@ -50,10 +50,6 @@ var sqlOpen = func(dbType, connectStr string) (*sql.DB, error) {
 func NewDbMapFromConfig(config *mysql.Config) (*gorp.DbMap, error) {
 	adjustMySQLConfig(config)
 
-	logger := blog.GetAuditLogger()
-
-	logger.Debug("Connecting to database")
-
 	db, err := sqlOpen("mysql", config.FormatDSN())
 	if err != nil {
 		return nil, err
@@ -67,8 +63,6 @@ func NewDbMapFromConfig(config *mysql.Config) (*gorp.DbMap, error) {
 
 	initTables(dbmap)
 
-	logger.Debug("Connected to database")
-
 	return dbmap, err
 }