Log Message:
Update pkg_comp to 2.1:

Changes in version 2.1
======================

**Released on 2019-01-14.**

* Issue 3: Added a new `PBULK_LOG` setting to point at a location that
  holds all build logs, and made the `build` command print out details
  about such logs on success and failure.

* Issue 4: Fixed the installable bootstrap kit generated during a build
  to not leak pkg_comp-internal paths.

* Issue 10: Fixed generation of pkg_summary so that it includes all
  packages and not only those that were explicitly given to the `auto`
  or `build` commands after a clean rebuild of the sandbox.

* PR 20: Fixed the default Git repository from jsonn's to NetBSD's as
  it has moved upstream.

* Added a new `PKG_DEVELOPER` setting to enable pkgsrc development
  from within the sandbox.