zhash/zhashx: Use selftest-rw for selftest cache

Clangd uses `.cache` directory which conflicts with the directory used
by the selftests of zhash and zhashx, which caused the tests to fail
unnecessarily. Changed those to use `src/selftest-rw` like other tests.

Author: oko256

src/zdir.c

@@ -334,7 +334,7 @@ zdir_flatten (zdir_t *self)
     uint index = 0;
     if (self)
         index = s_dir_flatten (self, files, index);
-    
+
     //sort flattened list for proper patches computation
     zlist_t *sorted = zlist_new ();
     for (size_t i = 0; i < self->count; i++)
@@ -343,7 +343,7 @@ zdir_flatten (zdir_t *self)
     for (size_t i = 0; i < self->count; i++)
         files[i] = (zfile_t *) zlist_pop (sorted);
     zlist_destroy (&sorted);
-    
+
     return files;
 }
 

src/zhash.c

@@ -884,15 +884,15 @@ zhash_test (bool verbose)
     //  Test save and load
     zhash_comment (hash, "This is a test file");
     zhash_comment (hash, "Created by %s", "czmq_selftest");
-    zhash_save (hash, ".cache");
+    zhash_save (hash, "src/selftest-rw/zhash-test");
     copy = zhash_new ();
     assert (copy);
-    zhash_load (copy, ".cache");
+    zhash_load (copy, "src/selftest-rw/zhash-test");
     item = (char *) zhash_lookup (copy, "LIVEBEEF");
     assert (item);
     assert (streq (item, "dead beef"));
     zhash_destroy (&copy);
-    zsys_file_delete (".cache");
+    zsys_file_delete ("src/selftest-rw/zhash-test");
 
     //  Delete a item
     zhash_delete (hash, "LIVEBEEF");

src/zhashx.c

@@ -1250,15 +1250,15 @@ zhashx_test (bool verbose)
     //  Test save and load
     zhashx_comment (hash, "This is a test file");
     zhashx_comment (hash, "Created by %s", "czmq_selftest");
-    zhashx_save (hash, ".cache");
+    zhashx_save (hash, "src/selftest-rw/zhashx-test");
     copy = zhashx_new ();
     assert (copy);
-    zhashx_load (copy, ".cache");
+    zhashx_load (copy, "src/selftest-rw/zhashx-test");
     item = (char *) zhashx_lookup (copy, "LIVEBEEF");
     assert (item);
     assert (streq (item, "dead beef"));
     zhashx_destroy (&copy);
-    zsys_file_delete (".cache");
+    zsys_file_delete ("src/selftest-rw/zhashx-test");
 
     //  Delete a item
     zhashx_delete (hash, "LIVEBEEF");