[product: zaphod][project: zaphod-v0.3]: Partial implementation of startvm.

SYNOPSIS
[modified]m42/zaphod.py: Implementation of startvm (not tested.)
[modified]m42/test/test_zaphod.py: Skeleton test case for startvm.

DETAILS
This is a partial implementation of startvm. The method although
implemented has not been tested. This is because to test
startvm, one has to implement login and remote command execution
capabilities. This is a significantly more involved task
as it essentially means replication the functionality planned
for the entire v0.3 release. So this test will be implemented
in a bootstrapped manner over a number of commits.