Feature/tor health checks (#426)

* wip

* wraps up core tor health check feature, still need to fix the boundaries with the rest of embassyd

* need to please borrow checker

* please the borrow checker

* wire it in

* finishes the feature

* Apply suggestions from code review

* fixes tor restart functionality

* makes tor replacement more resilient, adds embassyd service in init and replace

appmgr/Cargo.lock

@@ -2313,6 +2313,7 @@ dependencies = [
  "time 0.2.27",
  "tokio 1.10.1",
  "tokio-native-tls",
+ "tokio-socks",
  "url",
  "wasm-bindgen",
  "wasm-bindgen-futures",
@@ -3260,6 +3261,18 @@ dependencies = [
  "webpki",
 ]
 
+[[package]]
+name = "tokio-socks"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51165dfa029d2a65969413a6cc96f354b86b464498702f174a4efa13608fd8c0"
+dependencies = [
+ "either",
+ "futures-util",
+ "thiserror",
+ "tokio 1.9.0",
+]
+
 [[package]]
 name = "tokio-stream"
 version = "0.1.7"