copyright/license: Add missing file extensions

Proper file extensions help 'copyright header checker' find files
that should contain copyright info. Extensions also clearly indicate
file type, and help to fit in with the file naming convention.

Signed-off-by: Rafal Stefanowski <rafal.stefanowski@intel.com>

configure

@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# Copyright(c) 2012-2021 Intel Corporation
+# Copyright(c) 2012-2022 Intel Corporation
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
@@ -79,7 +79,7 @@ fi
 
 # Run version generator with 'build' flag to
 # indicate that we are in the build process
-(cd tools && ./cas_version_gen build)
+(cd tools && ./cas_version_gen.sh build)
 if [ $? -ne 0 ]; then
 	echo "Error: failed to obtain CAS version" >&2
 	exit 1