chore(service-profiles): remove Default bounds

see linkerd/linkerd2#8733 for more
information.

see also, #3651 #3653, #3654, and #3655 for some related pull requests.

in hyper 1.x, `Incoming` bodies do not provide a `Default`
implementation. compare the trait implementations here:

* https://docs.rs/hyper/0.14.31/hyper/body/struct.Body.html#impl-Default-for-Body
* https://docs.rs/hyper/latest/hyper/body/struct.Incoming.html#trait-implementations

this commit removes `Default` bounds from `Client<R, S>` used to create
watches on service profiles.

Signed-off-by: katelyn martin <[email protected]>

Author: cratelyn

linkerd/service-profiles/src/client.rs

@@ -33,7 +33,7 @@ impl<R, S> Client<R, S>
 where
     S: GrpcService<BoxBody> + Clone + Send + 'static,
     S::ResponseBody: Send + Sync,
-    S::ResponseBody: Default + Body<Data = tonic::codegen::Bytes> + Send + 'static,
+    S::ResponseBody: Body<Data = tonic::codegen::Bytes> + Send + 'static,
     <S::ResponseBody as Body>::Error:
         Into<Box<dyn std::error::Error + Send + Sync + 'static>> + Send,
     S::Future: Send,
@@ -65,7 +65,7 @@ impl<T, R, S> Service<T> for Client<R, S>
 where
     T: Param<LookupAddr>,
     S: GrpcService<BoxBody> + Clone + Send + 'static,
-    S::ResponseBody: Default + Body<Data = tonic::codegen::Bytes> + Send + 'static,
+    S::ResponseBody: Body<Data = tonic::codegen::Bytes> + Send + 'static,
     <S::ResponseBody as Body>::Error:
         Into<Box<dyn std::error::Error + Send + Sync + 'static>> + Send,
     S::Future: Send,
@@ -112,7 +112,7 @@ type InnerFuture =
 impl<S> Inner<S>
 where
     S: GrpcService<BoxBody> + Clone + Send + 'static,
-    S::ResponseBody: Default + Body<Data = tonic::codegen::Bytes> + Send + 'static,
+    S::ResponseBody: Body<Data = tonic::codegen::Bytes> + Send + 'static,
     <S::ResponseBody as Body>::Error:
         Into<Box<dyn std::error::Error + Send + Sync + 'static>> + Send,
     S::Future: Send,
@@ -129,7 +129,7 @@ where
 impl<S> Service<LookupAddr> for Inner<S>
 where
     S: GrpcService<BoxBody> + Clone + Send + 'static,
-    S::ResponseBody: Default + Body<Data = tonic::codegen::Bytes> + Send + 'static,
+    S::ResponseBody: Body<Data = tonic::codegen::Bytes> + Send + 'static,
     <S::ResponseBody as Body>::Error:
         Into<Box<dyn std::error::Error + Send + Sync + 'static>> + Send,
     S::Future: Send,