pre-commit: Improve error message if not in a workon

Change-Id: I8c8597f8a415053094d0886e972c9ca1e93cc09d
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/42028
Reviewed-by: Matt K. Light <mklight@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Thi N. Tran <thi@us.ibm.com>
Reviewed-by: Nicholas E. Bofferding <bofferdn@us.ibm.com>

src/build/tools/pre-commit

@@ -6,7 +6,7 @@
 #
 # OpenPOWER HostBoot Project
 #
-# Contributors Listed Below - COPYRIGHT 2011,2016
+# Contributors Listed Below - COPYRIGHT 2011,2017
 # [+] International Business Machines Corp.
 #
 #
@@ -30,6 +30,8 @@ if [ -f $TOOLSDIR/pre-commit-actions ]; then
 elif [ -f $TOOLSDIR/pre-commit-prologs ]; then
     $TOOLSDIR/pre-commit-prologs
 else
-    echo "Missing pre-commit files"
+    echo Error: environment not setup properly...
+    echo "Run 'source env.bash' or './hb workon' based on your current environment"
+    echo "For more info run './hb --help'"
     exit -1
 fi