Enable more clang-tidy checks and treat them as errors

Test: tests/runtests.sh
Change-Id: If59480cee6460847f5c1cef17e3ef036b8e75651
diff --git a/server/IptablesRestoreController.cpp b/server/IptablesRestoreController.cpp
index eb67b75..8339177 100644
--- a/server/IptablesRestoreController.cpp
+++ b/server/IptablesRestoreController.cpp
@@ -104,8 +104,8 @@
         processTerminated = true;
     }
 
-    const pid_t pid;
-    const int stdIn;
+    const pid_t pid;  // NOLINT(misc-non-private-member-variables-in-classes)
+    const int stdIn;  // NOLINT(misc-non-private-member-variables-in-classes)
 
     struct pollfd pollFds[2];
     std::string errBuf;