(MAINT) Rename `clojure-version` to avoid shadowing
(MAINT) Rename `clojure-version` to avoid shadowing

In a recent PR, we introduced a var called `clojure-version` in
the project.clj, to coordinate our references to our clojure
dependency version.  It turns out that the name `clojure-version`
is already in use in `clojure.core`, so this var results in a
warning that we are shadowing the upstream var.

This commit changes the var name to `clj-version`, so that we
will no longer be shadowing the built-in name.

waynr/puppet-server,camlow325/puppetserver,erikPrime/puppetserver,waynr/puppetserver,cprice404/puppetserver,erikPrime/puppet-server,shrug/puppet-server,puppetlabs/puppet-server,puppetlabs/puppetserver,shrug/puppet-server,waynr/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver,cprice404/puppet-server,rlinehan/puppetserver,er0ck/puppetserver,rlinehan/puppet-server,puppetlabs/puppetserver,camlow325/puppet-server,er0ck/puppetserver,shrug/puppet-server,puppetlabs/puppet-server,shrug/puppet-server,er0ck/puppetserver,rlinehan/puppetserver,erikPrime/puppetserver,rlinehan/puppetserver,erikPrime/puppet-server,briancain/puppet-server,cprice404/puppetserver,rlinehan/puppet-server,cprice404/puppetserver,briancain/puppet-server,puppetlabs/puppet-server,camlow325/puppet-server,rlinehan/puppetserver,camlow325/puppetserver,camlow325/puppet-server,erikPrime/puppetserver,camlow325/puppetserver,briancain/puppet-server,cprice404/puppet-server,cprice404/puppet-server,er0ck/puppetserver,camlow325/puppetserver,waynr/puppet-server,rlinehan/puppet-server,waynr/puppetserver,erikPrime/puppet-server,waynr/puppetserver