Use template for REST port config

[dfarrell07]

We're currently using file_line, which is basically a sed-like Puppet feature for changing a file based on a regex, to configure ODL's REST port.

For consistency with the Karaf config and Puppet best practice norms (I think), it'd be ideal to move to a template for this config.

This is blocking #47, likely also #48.

  # TODO: Is this include needed?
  include stdlib
  # TODO: Better var name (this is from PR #35)
  # TODO: Consider moving to a template, for consistency
  # TODO: Likely need to set user/group/mode
  $myline= "    <Connector port=\"${odl_rest_port}\" protocol=\"HTTP/1.1\""
  file_line { 'tomcatport':
    ensure => present,
    path   => '/opt/opendaylight/configuration/tomcat-server.xml',
    line   => $myline,
    match  => '^\s*<Connector\s*port=\"[0-9]+\"\s*protocol=\"HTTP\/1.1\"$',
  }