Simplify and automate the build steps by using a Makefile and mock. 

Simplify and automate the build steps by using a Makefile and mock. 

Now possible to make a 1 line change in the Makefile to switch to a different release of etcd. 
Spectool also bundled due to the standard version using wget, which doesn't save the AWS S3 generated URLs correctly, causing the build to fail.