[entropy.cache] drop EntropyCacher.CACHE_IDS['library_breakage']

lib/entropy/cache.py

@@ -42,7 +42,6 @@ class EntropyCacher(Singleton):
             'atom_search': 'atom_search/atom_search_',
             'check_package_update': 'check_update/package_update_',
             'depends_tree': 'depends/depends_tree_',
-            'library_breakage': 'libs_break/library_breakage_',
             'mask_filter': 'match/mask_filter',
         }
 

lib/entropy/client/interfaces/dep.py

@@ -1888,8 +1888,7 @@ class CalculatorsMixin:
             sha = hashlib.sha1()
             sha.update(const_convert_to_rawstring(cache_s))
 
-            cache_key = "%s%s" % (
-                EntropyCacher.CACHE_IDS['library_breakage'], sha.hexdigest(),)
+            cache_key = "library_breakage/%s" % (sha.hexdigest(),)
 
             cached = self._cacher.pop(cache_key)
             if cached is not None: