Don't keep "disabled" substituters running

For instance, it's pointless to keep copy-from-other-stores running if
there are no other stores, or download-using-manifests if there are no
manifests.  This also speeds things up because we don't send queries
to those substituters.

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/substituter.sh b/tests/substituter.sh
index 885655760e05..9aab295de87b 100755
--- a/tests/substituter.sh
+++ b/tests/substituter.sh
@@ -1,4 +1,5 @@
 #! /bin/sh -e
+echo
 echo substituter args: $* >&2
 
 if test $1 = "--query"; then