fork: Fix an exception for cloning by hardlink
fork: Fix an exception for cloning by hardlink

An exception could be occurred while doing straight-copy as a fallback
for cloning by hardlink because a relative path is used as an uri
parameter for CloneCommand.

yona-projects/yona,yona-projects/yona,doortts/forked-for-history,doortts/fork-yobi,naver/yobi,doortts/fork-yobi,oolso/yobi,bloodybear/yona,ChangsungKim/TestRepository01,oolso/yobi,brainagenet/yobi,brainagenet/yobi,ihoneymon/yobi,ahb0327/yobi,yona-projects/yona,Limseunghwan/oss,doortts/fork-yobi,ahb0327/yobi,Limseunghwan/oss,doortts/forked-for-history,ahb0327/yobi,ihoneymon/yobi,ihoneymon/yobi,Limseunghwan/oss,oolso/yobi,ChangsungKim/TestRepository01,naver/yobi,violetag/demo,bloodybear/yona,bloodybear/yona,brainagenet/yobi,naver/yobi,yona-projects/yona,bloodybear/yona,doortts/fork-yobi,doortts/forked-for-history,violetag/demo