(PE-3369) Remove clj-http dependency
(PE-3369) Remove clj-http dependency

Remove clj-http dependency from tests. Did not replace
with clj-http-client, as the clj-http dependency was not
being used anywhere in the tests.

puppetlabs/trapperkeeper,senior/trapperkeeper,rbramwell/trapperkeeper,camlow325/trapperkeeper,senior/trapperkeeper,scotje/trapperkeeper