use db cache in jenkins bok choy builds

move migration calculation to reset test-db script

scripts/reset-test-db.sh

@@ -43,6 +43,9 @@ for i in "$@"; do
         -m|--migrations)
             APPLY_MIGRATIONS=true
             ;;
+        -c|--calculate_migrations)
+            CALCULATE_MIGRATIONS=true
+            ;;
     esac
 done
 
@@ -51,6 +54,14 @@ declare -a database_order
 databases=(["default"]="edxtest" ["student_module_history"]="student_module_history_test")
 database_order=("default" "student_module_history")
 
+calculate_migrations() {
+    echo "Calculating migrations for fingerprinting."
+    output_file="common/test/db_cache/bok_choy_${db}_migrations.yaml"
+    # Redirect stdout to /dev/null because the script will print
+    # out all migrations to both stdout and the output file.
+    ./manage.py lms --settings $SETTINGS show_unapplied_migrations --database $db --output_file $output_file 1>/dev/null
+}
+
 run_migrations() {
     echo "Running the lms migrations on the $db bok_choy DB."
     ./manage.py lms --settings $SETTINGS migrate --database $db --traceback --noinput
@@ -115,4 +126,8 @@ elif [[ $APPLY_MIGRATIONS ]]; then
     for db in "${database_order[@]}"; do
         run_migrations
     done
+elif [[ $CALCULATE_MIGRATIONS ]]; then
+    for db in "${database_order[@]}"; do
+        calculate_migrations
+    done
 fi