commands: execute checkunfinished and bailifchanged inside wlock scope Before this patch, "hg import" executes below before acquisition of wlock: - cmdutil.checkunfinished() - cmdutil.bailifchanged() It may cause unintentional result, if another command runs parallelly (see also issue4368). To avoid this issue, this patch executes 'cmdutil.checkunfinished()' and 'cmdutil.bailifchanged()' inside wlock scope of "hg import".