Adding support for TLS connections for gRPC clients

This patch uses BoringSSL to negotiate TLS sessions under the hood.

Change-Id: I1495479ff33654f9cffe04d61f293c3e923b8aeb
diff --git a/tools/build/bazel/generate_workspace.bzl b/tools/build/bazel/generate_workspace.bzl
index d9ceb5d..edd8a31 100644
--- a/tools/build/bazel/generate_workspace.bzl
+++ b/tools/build/bazel/generate_workspace.bzl
@@ -1,4 +1,4 @@
-# ***** This file was auto-generated at Thu, 14 Feb 2019 20:57:40 GMT. Do not edit this file manually. *****
+# ***** This file was auto-generated at Sat, 23 Feb 2019 01:30:12 GMT. Do not edit this file manually. *****
 # ***** Use onos-lib-gen *****
 
 load("//tools/build/bazel:variables.bzl", "ONOS_GROUP_ID", "ONOS_VERSION")
@@ -802,6 +802,12 @@
             jar_sha256 = "fe2f2e97d6c65dc280623dcfd24337d8a5c7377049c120842f2c59fb83d7408a",
             licenses = ["notice"],
             jar_urls = ["http://repo1.maven.org/maven2/io/netty/netty-codec-socks/4.1.32.Final/netty-codec-socks-4.1.32.Final.jar"],        )
+    if "io_netty_netty_tcnative_boringssl" not in native.existing_rules():
+        java_import_external(
+            name = "io_netty_netty_tcnative_boringssl",
+            jar_sha256 = "c0bbfcb116ae9928ebb17cbfbdd80ee51980ad228a4fffb0cb3137ac91b1bc09",
+            licenses = ["notice"],
+            jar_urls = ["http://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static/2.0.20.Final/netty-tcnative-boringssl-static-2.0.20.Final.jar"],        )
     if "objenesis" not in native.existing_rules():
         java_import_external(
             name = "objenesis",
@@ -1390,6 +1396,7 @@
 artifact_map["@io_netty_netty_codec_http2//:io_netty_netty_codec_http2"] = "mvn:io.netty:netty-codec-http2:jar:4.1.32.Final"
 artifact_map["@io_netty_netty_codec_http//:io_netty_netty_codec_http"] = "mvn:io.netty:netty-codec-http:jar:4.1.32.Final"
 artifact_map["@io_netty_netty_codec_socks//:io_netty_netty_codec_socks"] = "mvn:io.netty:netty-codec-socks:jar:4.1.32.Final"
+artifact_map["@io_netty_netty_tcnative_boringssl//:io_netty_netty_tcnative_boringssl"] = "mvn:io.netty:netty-tcnative-boringssl-static:jar:2.0.20.Final"
 artifact_map["@objenesis//:objenesis"] = "mvn:org.objenesis:objenesis:jar:2.6"
 artifact_map["@openflowj//:openflowj"] = "mvn:org.onosproject:openflowj:jar:3.2.1.onos"
 artifact_map["@org_osgi_util_function//:org_osgi_util_function"] = "mvn:org.osgi:org.osgi.util.function:jar:1.1.0"