Build indented xml

Signed-off-by: Aram Price <aprice@pivotallabs.com>
Backfill jobs spec for build_parameters property

Signed-off-by: Aram Price <aprice@pivotallabs.com>
Formatting

Signed-off-by: Aram Price <aprice@pivotallabs.com>
Cleanup spec

Signed-off-by: Aram Price <aprice@pivotallabs.com>
Jenkins Job Config supports blocking on downstream

Signed-off-by: Aram Price <aprice@pivotallabs.com>