(SERVER-2418) Update clj-parent to 1.7.19
(SERVER-2418) Update clj-parent to 1.7.19

This commit updates clj-parent to 1.7.19, which pulls in
jackson-databind 2.9.8, fixing several security issues.

puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppetserver