mgr/cephadm: add function to get service specs by service type

Instead of having to get all of them and then filter the results by
service type, we can just have a function in the SpecStore class to
do it for us.

Signed-off-by: Adam King <[email protected]>

Author: adk3798

src/pybind/mgr/cephadm/inventory.py

@@ -273,6 +273,20 @@ def __getitem__(self, name: str) -> SpecDescription:
                                self.spec_created[name],
                                self.spec_deleted.get(name, None))
 
+    def get_by_service_type(self, service_type: str) -> List[SpecDescription]:
+        matching_specs: List[SpecDescription] = []
+        for name, spec in self._specs.items():
+            if spec.service_type == service_type:
+                matching_specs.append(
+                    SpecDescription(
+                        spec,
+                        self._rank_maps.get(name),
+                        self.spec_created[name],
+                        self.spec_deleted.get(name, None)
+                    )
+                )
+        return matching_specs
+
     @property
     def active_specs(self) -> Mapping[str, ServiceSpec]:
         return {k: v for k, v in self._specs.items() if k not in self.spec_deleted}