Add a class named RemoteFile in virttest-remote module.

A class to handle remote file.
Currently, we support three operations on remote file.
add: append lines in to file.
sub: replace string which match pattern to repl.
remove: delete lines that match pattern.

Signed-off-by: yangdongsheng <yangds.fnst@cn.fujitsu.com>
Add some unittest for RemoteFile.

Signed-off-by: yangdongsheng <yangds.fnst@cn.fujitsu.com>
Fix for RemoteFile and unittest.

(1).Change uuid to tempfile to build a unique filename.
(2).Add a __del__ method for unittest class to remove remote_file.

Signed-off-by: yangdongsheng <yangds.fnst@cn.fujitsu.com>

Fix indenting error in remote.py.

Signed-off-by: yangdongsheng <yangds.fnst@cn.fujitsu.com>
Merge pull request #526 from yangdongsheng/remote_edit

Add remote_edit method into virttest/remote.py.