Update sysutils/puppet to 3.8.7.
Clean up dependencies and resolve the json/json_pure conflict.

Changes since 3.8.6:

- PUP-4818: One part of the relative namespacing feature was not
  removed when using the future parser. When a class was declared
  with a resource like expression the references to classes were
  still interpreted as being relative.
- PUP-6113: Puppet will no longer attempt to retrieve the
  nonexistent password_min_age property from LDAP users on
  Solaris.
- PUP-6073: launchd plists with line continuations no longer cause
  the launchd service provider to return Error: Could not prefetch
  service provider 'launchd': undefined method to_ruby for
  nil:NilClass.
- PUP-5898: :undef caused unexpected behaviors with hashes due to
  the 3.x calling convention also applying to resource
  expressions.
- PUP-5637: Puppet systemd packages now include an ExecReload
  command in the puppet.service files in order to facilitate
  graceful restart on systemd systems.
- PUP-5356: Fixed the Puppet Nagios extension with Ruby 1.9.3+.
- PUP-4545: Removed a script that restarts Puppet in response to
  network changes on EL based systems.

(fhajny)