Add RESOLVER_PARAMS_RETRY_COUNT for configuring the retries.

Test: built / flashed / booted
      netd_unit_test, netd_integration_test, libnetd_resolv_test

Change-Id: I68db331b3c8ad8e43696816642f4d5941138c8bc
diff --git a/resolv/res_cache.cpp b/resolv/res_cache.cpp
index 756844c..d766baf 100644
--- a/resolv/res_cache.cpp
+++ b/resolv/res_cache.cpp
@@ -1712,6 +1712,7 @@
     params->min_samples = 0;
     params->max_samples = 0;
     params->base_timeout_msec = 0;  // 0 = legacy algorithm
+    params->retry_count = 0;
 }
 
 int resolv_set_nameservers_for_net(unsigned netid, const char** servers, const int numservers,