To prevent remote code injection on Sheepdog store

Change-Id: Iae92eaf9eb023f36a1bab7c20ea41c985f2bf51b
Signed-off-by: Zhi Yan Liu <zhiyanl@cn.ibm.com>
(cherry picked from commit 13069a4017d36a549576a21ca3ec5b15c411effc)
(cherry picked from commit 4db73ac4417ee012915ff109e1ca3e60036d5388)