Tracking issue for the removal of TravisCI.

It's been useful, but as we found for Clear Containers, Travis is too limited in its abilities. The main issues being:

• The "dreaded Travis bug".

• No VT-x meaning we can only run unit tests.

  Too restrictive: we need to be able to run all our tests.

Remove the Travis config file from the following repos:

• agent
• ksm-throttler
• osbuilder
• proxy
• qemu
• runtime
• shim
• tests

Before removing Travis from a repo, ensure the following:

• Ensure unit tests running and passing under Jenkins

  Known issue: Jenkins doesn't provide /dev/tty whereas Travis does.

• Ensure code coverage being reported under Jenkins.

• Ensure no other checks called from .travis.yml missing from Jenkins.