Remove changes introduced as part of LIBCLOUD-278.

Those changes introduces a regression in client.run method which would only make
it work if you passed in a relative or absolute path to the shell script to this
method.


git-svn-id: https://svn.apache.org/repos/asf/libcloud/trunk@1454783 13f79535-47bb-0310-9956-ffa450edef68