[wrt]update xwalkctl to pkgcmd
Impacted TCs num(approved): New 0, update 24, deleted 0
Unit test platform: [tizen]
Test Result:

wrt-packagemgt-tizen-tests: pass 8, fail 0 ,block 7
wrt-digitalsign-tizen-tests:pass 1, fail 0 ,block 1
wrt-packertool-tizen-tests: pass 3, fail 0 ,block 0
wrt-rtbin-tizen-tests       pass 4, fail 0 ,block 0