fix regression: llarp::Context::CallSafe was not deferring call on startup

llarp/context.cpp

@@ -27,7 +27,7 @@ namespace llarp
   {
     if (!loop)
       return false;
-    loop->call(std::move(f));
+    loop->call_soon(std::move(f));
     return true;
   }
 

llarp/ev/ev_libuv.cpp

@@ -370,6 +370,7 @@ namespace llarp::uv
   {
     if (m_EventLoopThreadID)
       return *m_EventLoopThreadID == std::this_thread::get_id();
+    // assume we are in it because we haven't started up yet
     return true;
   }
 

test/regress/2020-06-08-key-backup-bug.cpp

@@ -6,7 +6,7 @@
 
 llarp::RuntimeOptions opts = {false, false, false};
 
-/// make a llarp_main* with 1 endpoint that specifies a keyfile
+/// make a context with 1 endpoint that specifies a keyfile
 static std::shared_ptr<llarp::Context>
 make_context(std::optional<fs::path> keyfile)
 {