ENG-3453: Add TLS support to RPC layer

Summary:
Added TLS support to RPC layer.
Also separated Connection class into transport and logic layers.

Test Plan: ybd --cxx-test rpc_stub-test --gtest_filter *.TLS

Reviewers: mikhail, amitanand, pritam.damania

Reviewed By: pritam.damania

Subscribers: bogdan, bharat, karthik, ybase

Differential Revision: https://phabricator.dev.yugabyte.com/D4953

CMakeLists.txt

@@ -1151,6 +1151,12 @@ function(ADD_YB_TEST REL_TEST_NAME)
   endif()
 endfunction()
 
+function(ADD_YB_TESTS TESTS)
+  foreach(TEST ${TESTS})
+    ADD_YB_TEST(${TEST})
+  endforeach(TEST)
+endfunction()
+
 # A wrapper for add_dependencies() that is compatible with NO_TESTS.
 function(ADD_YB_TEST_DEPENDENCIES REL_TEST_NAME)
   if(NO_TESTS)

src/yb/rpc/CMakeLists.txt

@@ -30,6 +30,8 @@
 # under the License.
 #
 
+YB_INCLUDE_EXTENSIONS()
+
 #### Global header protobufs
 PROTOBUF_GENERATE_CPP(
   RPC_HEADER_PROTO_SRCS RPC_HEADER_PROTO_HDRS RPC_HEADER_PROTO_TGTS
@@ -80,16 +82,19 @@ set(YRPC_SRCS
     serialization.cc
     service_if.cc
     service_pool.cc
+    tcp_stream.cc
     thread_pool.cc
-    yb_rpc.cc)
+    yb_rpc.cc
+    ${RPC_SRCS_EXTENSIONS})
 
 set(YRPC_LIBS
   redis_protocol_proto
   rpc_header_proto
   rpc_introspection_proto
   yb_util
   gutil
-  libev)
+  libev
+  ${RPC_LIBS_EXTENSIONS})
 
 ADD_YB_LIBRARY(yrpc
   SRCS ${YRPC_SRCS}
@@ -136,3 +141,4 @@ ADD_YB_TEST(rpc-test)
 ADD_YB_TEST(rpc_stub-test RUN_SERIAL true)
 ADD_YB_TEST(scheduler-test)
 ADD_YB_TEST(thread_pool-test)
+ADD_YB_TESTS(${RPC_ADDITIONAL_TESTS})