Backport commits from r1439233:r1439246 from trunk:

Fix the ScriptDeployment step to work correctly if user provides a relative path
for the script argument.

Contributed by Jaume devesa, part of LIBCLOUD-278.


git-svn-id: https://svn.apache.org/repos/asf/libcloud/branches/0.12.x@1439248 13f79535-47bb-0310-9956-ffa450edef68