Add test-network delay option

Add a --delay option to test-network.sh, which configures the delay before
the chutney network tests for data transmission. The default remains at
18 seconds if the argument isn't specified.

Apparently we should be using bootstrap status for this (eventually).

Partially implements ticket 13161.

changes/feature13161-test-network-delay-option

@@ -0,0 +1,4 @@
+  o Minor features (testing):
+    - Add a --delay option to test-network.sh, which configures the delay
+      before the chutney network tests for data transmission.
+      Partially implements ticket 13161.

src/test/test-network.sh

@@ -17,6 +17,10 @@ do
       export NETWORK_FLAVOUR="$2"
       shift
     ;;
+    --delay|--sleep|--bootstrap-time|--time)
+      export BOOTSTRAP_TIME="$2"
+      shift
+    ;;
     *)
       echo "Sorry, I don't know what to do with '$1'."
       exit 2
@@ -41,7 +45,7 @@ PATH="$TOR_DIR/src/or:$TOR_DIR/src/tools:$PATH"
 
 # Sleep some, waiting for the network to bootstrap.
 # TODO: Add chutney command 'bootstrap-status' and use that instead.
-BOOTSTRAP_TIME=18
+BOOTSTRAP_TIME=${BOOTSTRAP_TIME:-18}
 $ECHO_N "$myname: sleeping for $BOOTSTRAP_TIME seconds"
 n=$BOOTSTRAP_TIME; while [ $n -gt 0 ]; do
     sleep 1; n=$(expr $n - 1); $ECHO_N .