connection: Remove clear_cache callback

It doesn't actually accomplish what we want for the virt-manager case,
and cache_new_pool should cover our needs now

virtManager/connection.py

@@ -319,16 +319,6 @@ class vmmConnection(vmmGObject):
             self._wait_for_condition(compare_cb)
         self._backend.cb_cache_new_pool = cache_new_pool
 
-        def clear_cache(pools=False):
-            if not pools:
-                return
-
-            # This isn't synchronous, so any virtinst callers need to
-            # take that into account.
-            self.schedule_priority_tick(pollpool=True)
-
-        self._backend.cb_clear_cache = clear_cache
-
 
     ########################
     # General data getters #
@@ -1007,7 +997,6 @@ class vmmConnection(vmmGObject):
         self._backend.cb_fetch_all_pools = None
         self._backend.cb_fetch_all_nodedevs = None
         self._backend.cb_fetch_all_vols = None
-        self._backend.cb_clear_cache = None
         self._backend.cb_cache_new_pool = None
 
     def open(self):

virtinst/connection.py

@@ -80,7 +80,6 @@ class VirtualConnection(object):
         self.cb_fetch_all_pools = None
         self.cb_fetch_all_vols = None
         self.cb_fetch_all_nodedevs = None
-        self.cb_clear_cache = None
         self.cb_cache_new_pool = None
 
 
@@ -166,14 +165,6 @@ class VirtualConnection(object):
     _FETCH_KEY_VOLS = "vols"
     _FETCH_KEY_NODEDEVS = "nodedevs"
 
-    def clear_cache(self, pools=False):
-        if self.cb_clear_cache:
-            self.cb_clear_cache(pools=pools)  # pylint: disable=not-callable
-            return
-
-        if pools:
-            self._fetch_cache.pop(self._FETCH_KEY_POOLS, None)
-
     def _fetch_all_guests_raw(self):
         ignore, ignore, ret = pollhelpers.fetch_vms(
             self, {}, lambda obj, ignore: obj)

virtinst/diskbackend.py

@@ -175,7 +175,6 @@ def manage_path(conn, path):
     poolxml.type = poolxml.TYPE_DIR
     poolxml.target_path = dirname
     pool = poolxml.install(build=False, create=True, autostart=True)
-    conn.clear_cache(pools=True)
 
     vol = _lookup_vol_by_basename(pool, path)
     return vol, pool

virtinst/kernelupload.py

@@ -47,7 +47,6 @@ def _build_pool(conn, meter, path):
     # we probably don't have correct perms
     ret = poolbuild.install(meter=meter, create=True, build=False,
                             autostart=True)
-    conn.clear_cache(pools=True)
     return ret
 
 

virtinst/storage.py

@@ -226,7 +226,6 @@ class StoragePool(_StorageObject):
             defpool.name = name
             defpool.target_path = path
             defpool.install(build=True, create=True, autostart=True)
-            conn.clear_cache(pools=True)
             return defpool
         except Exception as e:
             raise RuntimeError(