Change log library to spdlog, expose log levels to user (#72)

* Change from glog to spdlog

* Remove HA tests

* Remove logrotate log configuration

* Define custom main for unit gtests

tests/unit/network_endpoint.cpp

@@ -1,9 +1,8 @@
-#include <iostream>
-
 #include "gtest/gtest.h"
 
 #include "io/network/endpoint.hpp"
 #include "io/network/network_error.hpp"
+#include "utils/logging.hpp"
 
 using endpoint_t = io::network::Endpoint;
 
@@ -32,8 +31,3 @@ TEST(Endpoint, IPv6) {
   // test address invalid
   EXPECT_THROW(endpoint_t("::g", 12345), io::network::NetworkError);
 }
-
-int main(int argc, char **argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}