Let testing networks override ABSOLUTE_MIN_VALUE_FOR_FAST_FLAG

This adds a new option to fix bug 8508 which broke chutney
networks. The bug was introduced by 317d16de.

src/or/config.c

@@ -341,6 +341,7 @@ static config_var_t option_vars_[] = {
   V(PerConnBWRate,               MEMUNIT,  "0"),
   V(PidFile,                     STRING,   NULL),
   V(TestingTorNetwork,           BOOL,     "0"),
+  V(TestingMinFastFlagThreshold, MEMUNIT,  "0"),
   V(OptimisticData,              AUTOBOOL, "auto"),
   V(PortForwarding,              BOOL,     "0"),
   V(PortForwardingHelper,        FILENAME, "tor-fw-helper"),

src/or/dirserv.c

@@ -2005,6 +2005,9 @@ dirserv_compute_performance_thresholds(routerlist_t *rl,
       ABSOLUTE_MIN_VALUE_FOR_FAST_FLAG,
       ABSOLUTE_MIN_VALUE_FOR_FAST_FLAG,
       INT32_MAX);
+    if (options->TestingTorNetwork) {
+      min_fast = (int32_t)options->TestingMinFastFlagThreshold;
+    }
     max_fast = networkstatus_get_param(NULL, "FastFlagMaxThreshold",
                                        INT32_MAX, min_fast, INT32_MAX);
     if (fast_bandwidth < (uint32_t)min_fast)

src/or/or.h

@@ -3910,6 +3910,9 @@ typedef struct {
    * of certain configuration options. */
   int TestingTorNetwork;
 
+  /** Minimum value for the Fast flag threshold on testing networks. */
+  uint64_t TestingMinFastFlagThreshold;
+
   /** If true, and we have GeoIP data, and we're a bridge, keep a per-country
    * count of how many client addresses have contacted us so that we can help
    * the bridge authority guess which countries have blocked access to us. */