shell_test.go and publisher_test.go had unnecessary references to
../test/test-ca.pem. This change makes them a little more self-contained.
Note: ca/ca_test.go still depends on test-ca.pem, but removing the dependency
turns out to be a little more complicated due to hardcoded expectations in some
of the test cases.
This used to be used for AMQP queue names. Now that AMQP is gone, these consts
were only used when printing a version string at startup. This changes
VersionString to just use the name of the current program, and removes
`const clientName = ` from many of our main.go's.
Jacob Hoffman-Andrews
Daniel
Jeff Hodges
Richard Barnes