Add methods to run commands and copy files to Host objects.
Adds a base class for integration tests which can currently install
and uninstall IPA in a "star" topology with per-test specified number
of hosts.
A simple test for user replication between two masters is provided.
Log files from the remote hosts can be marked for collection, but the
actual collection is left to a Nose plugin.
Part of the work for: https://fedorahosted.org/freeipa/ticket/3621
Integration tests are configured via environment variables.
Add a framework for parsing these variables and storing them
in easy-to-use objects.
Add an `ipa-test-config` executable that loads the configuration
and prints out variables needed in shell scripts.
Part of the work for https://fedorahosted.org/freeipa/ticket/3621
