fix bom & backslash test, and add steps to script for updating packaged test data

Signed-off-by: Jeff Knurek <knurek.stuff@gmail.com>

pkg/chart/loader/testdata/frobnitz_backslash/Chart.yaml

@@ -22,6 +22,8 @@ dependencies:
   - name: alpine
     version: "0.1.0"
     repository: https://example.com/charts
+    enabled: true
   - name: mariner
     version: "4.3.2"
     repository: https://example.com/charts
+    enabled: false

pkg/chart/loader/testdata/genfrob.sh

@@ -12,3 +12,7 @@ tar -zcvf frobnitz_backslash/charts/mariner-4.3.2.tgz mariner
 echo "Packing frobnitz"
 tar --exclude=ignore/* -zcvf frobnitz-1.2.3.tgz frobnitz
 tar --exclude=ignore/* -zcvf frobnitz_backslash-1.2.3.tgz frobnitz_backslash
+cp frobnitz-1.2.3.tgz frobnitz.v1.tgz
+
+tar --exclude=ignore/* -zcvf frobnitz_with_bom.tgz frobnitz_with_bom
+