Add sub repos into .gitignore

Change-Id: Ib60f4bad501008420d95fd4fa91e8e83804046e9
Issue-ID: INT-501
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>
diff --git a/.gitignore b/.gitignore
index b26692d..209db72 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,5 @@
 *~
 .checkstyle
 .DS_Store
+devtool/
+seccom/