Merge branch 'maint-0.2.9' into maint-0.3.0

changes/bug23985

+  o Minor bugfixes (bootstrapping):
+    - Fetch descriptors aggressively whenever we lack enough
+      to build circuits, regardless of how many descriptors we are missing.
+      Previously, we would delay launching the fetch when we had fewer than
+      15 missing descriptors, even if some of those descriptors were
+      blocking circuits from building. Fixes bug 23985; bugfix on
+      0.1.1.11-alpha. The effects of this bug became worse in 0.3.0.3-alpha,
+      when we began treating missing descriptors from our primary guards
+      as a reason to delay circuits.

src/or/routerlist.c

@@ -5016,6 +5016,11 @@ launch_descriptor_downloads(int purpose,
       log_debug(LD_DIR,
                 "There are enough downloadable %ss to launch requests.",
                 descname);
+    } else if (! router_have_minimum_dir_info()) {
+      log_debug(LD_DIR,
+                "We are only missing %d %ss, but we'll fetch anyway, since "
+                "we don't yet have enough directory info.",
+                n_downloadable, descname);
     } else {
 
       /* should delay */