PYTHON-3088 [4.0] Test rapid releases with load balancers (#880)

PYTHON-3088 [v3.13] Update load balancer tests to support dedicated load balancer port (#870)

(cherry picked from commit 1443d76)

Author: juliusgeo

.evergreen/config.yml

@@ -1714,12 +1714,9 @@ tasks:
       commands:
         - func: "bootstrap mongo-orchestration"
           vars:
-            VERSION: "latest"
             TOPOLOGY: "sharded_cluster"
             LOAD_BALANCER: true
         - func: "run load-balancer"
-          vars:
-            LOAD_BALANCER: true
         - func: "run tests"
 # }}}
     - name: "coverage-report"
@@ -1920,6 +1917,10 @@ axes:
         display_name: "MongoDB latest"
         variables:
           VERSION: "latest"
+      - id: "rapid"
+        display_name: "MongoDB rapid"
+        variables:
+          VERSION: "rapid"
 
   # Choice of Python runtime version
   - id: python-version
@@ -2636,7 +2637,7 @@ buildvariants:
 - matrix_name: "load-balancer"
   matrix_spec:
     platform: ubuntu-18.04
-    mongodb-version: ["5.0", "latest"]
+    mongodb-version: ["rapid", "latest"]
     auth-ssl: "*"
     python-version: ["3.6", "3.7", "3.8", "3.9", "pypy3.6", "pypy3.7"]
     loadbalancer: "*"

pymongo/pool.py

@@ -635,8 +635,6 @@ def _hello(self, cluster_time, topology_version, heartbeat_frequency, all_creden
             cmd["speculativeAuthenticate"] = auth_ctx.speculate_command()
 
         doc = self.command("admin", cmd, publish_events=False, exhaust_allowed=awaitable)
-        if not self.opts.load_balanced:
-            doc.pop("serviceId", None)
         hello = Hello(doc, awaitable=awaitable)
         self.is_writable = hello.is_writable
         self.max_wire_version = hello.max_wire_version
@@ -673,9 +671,6 @@ def _next_reply(self):
         unpacked_docs = reply.unpack_response()
         response_doc = unpacked_docs[0]
         helpers._check_command_response(response_doc, self.max_wire_version)
-        # Remove after PYTHON-2712.
-        if not self.opts.load_balanced:
-            response_doc.pop("serviceId", None)
         return response_doc
 
     def command(