[wrt][XWALK-2028] Add 2 tcs

Update webapp fail:
app2.xpk is app1 update app
step1:
1. xwalkctl --install app1.xpk
2. xwalkctl --install app2.xpk
Already installed:pkgid
webapp no update
stpe2:
1. xwalkctl --install app1.xpk
2. pgrep xwalk
3. kill  xwalkid
4. xwalkctl --install app2.xpk
Already installed:pkgid
webapp no update