remove check_package_config.py

doc/source/Utilities.rst

@@ -20,22 +20,6 @@ The utility located at util/show_duplicate_packages.py parses the output of ``sp
 
 The ``-d`` option shows only a list of the duplicates, as opposed to the default behavior, which is to show a print-out of all packages with colorized duplicates. In any case, the identification of any duplicates will yield a return code of 1. The ``-i`` option can be invoked multiple times to skip specific package names. The ``-c`` option can be used to ignore duplicates associated with different compilers; in an environment with, say, GCC and Intel copies of any given package, those two copies of a package will not be reported as duplicates.
 
-.. _Package_Config_Checker:
-
-------------------------------
-check_package_config.py
-------------------------------
-
-The utility at util/check_package_config.py is run after concretization in an active spack-stack environment (i.e., `$SPACK_ENV` is set) to confirm that the packages versions and variants in common/packages.yaml are respected in the concretization, as well as that any externals specified in site/packages.yaml are not being omitted. It does this by reading common/packages.yaml (for the version and variant settings), site/packages.yaml (for the external settings), and spack.lock. Usage is as follows:
-
-.. code-block:: console
-
-   spack env active envs/unified-env/
-   # To verify versions, variants, and externals:
-   ${SPACK_STACK_DIR}/util/check_package_config.py
-   # To ignore a known mismatch in version, variant, or external status for package 'esmf', use -i/--ignore option:
-   ${SPACK_STACK_DIR}/util/check_package_config.py -i esmf
-
 .. _Permissions_Checker:
 
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