fix SSLTest, clear previous ErrStr

Signed-off-by: Rishitha Kalicheti <rkalicheti1@bloomberg.net>

Author: rishitha957

cdb2jdbc/src/main/java/com/bloomberg/comdb2/jdbc/Comdb2Handle.java

@@ -1055,6 +1055,8 @@ private int runStatementInt(String sql, List<Integer> types) {
         int commitIsRetry = 0;
         int rc;
 
+        driverErrStr = null;
+        
         sql = sql.trim();
         String lowerSql = sql.toLowerCase();