[FAB-9594] generated files not license checked

Exclude files containing the generated magic string in the top two lines
from license checks. These files are generated by tools from source.

Change-Id: Id20084f0e68cec405c0abae0cbd4c77eb49945b3
Signed-off-by: Matthew Sykes <sykesmat@us.ibm.com>

Author: sykesm

scripts/check_license.sh

@@ -5,6 +5,12 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
+function filterGeneratedFiles {
+  for f in $@; do
+    head -n2 $f | grep -qE 'Code generated by.*DO NOT EDIT' || echo $f
+  done
+}
+
 function filterExcludedFiles {
   CHECK=`echo "$CHECK" \
 		| grep -v "^\.git/" \
@@ -24,6 +30,8 @@ function filterExcludedFiles {
 		| grep -v "\.md$" \
 		| grep -v "\.pb\.go$" \
 		| sort -u`
+
+  CHECK=$(filterGeneratedFiles "$CHECK")
 }
 
 CHECK=$(git diff --name-only --diff-filter=ACMRTUXB HEAD)