LxcProvider refactoring

Move prepare_host method from LxcProvider to LxcContainer.
Also make code some more clean.

Added configure_container.sh script which make initial
configuration within container.

Removed LxcProviderStaticIpTestCase. Now all provider's code
is covered in LxcProviderTestCase.

blueprint multihost-deploy

Change-Id: Icfe483d61deeadf3afae2eef2b74cdb1770c2a70