change github fetch protocol to ssh

Change-Id: I434302f9b439abb1aa8dcea938fd520f5c675bbb
Signed-off-by: huahang <huahang.liu@gmail.com>
Merge branch 'master' of ssh://gerrit.zerus.co:29418/manifest into dev

Signed-off-by: huahang <huahang.liu@gmail.com>

Conflicts:
	default.xml

Change-Id: I00f38adcb669404acc8c9ece8dd92cbf525e5bda