hibari >> gh33 and gdss-brick >> gh17

Summary:
- hibari >> gh33 - bad sequence file 'enoent' on a common log
  file deleted by the scavenger:
  * Introduce frozen state to common hlog file and make rename/6
    to be aware of it.

- gdss-brick >> gh17 - Redesign disk storage:
  * Remove experimental rename op DB.
  * Refactoring in do_do*/6 and squidflash_primer/3.

Details:
- brick_ets:
  * (WIP) Add is_sequence_frozen/1, is_sequence_frozen/2.
  * Extract a map fun from squidflash_primer/3 and make it
    a separate function keys_for_priming/3. Make it to be aware of
    is_sequence_frozen/1 so it will trigger squidflash_primer/3
    for rename/6 operation when old-key's hlog is frozen.
  * Remove any_readonly_keys_p/1 because keys_for_priming/3
    provides the same function.
  * Update rename_key/6 and filter_mods_from_upstream/2 to be
    aware of is_sequence_frozen/1 so they will not use
    ?KEY_SWITCHAROO when old-key's hlog is frozen.
  * Comment out a clause for insert_existing_value in a map fun
    in filter_mods_from_upstream/2.
  * Refactor: handle_call/3, do_do/6 and do_do1b/6.
  * Refactor rename_key/6; Delete rename_key2/7, Add rename_key_
    check_oldkey/6, rename_key_check_newkey/6, rename_key_apply_
    params/4.
  * Add rename_key_with_get_set_delete/6.
  * Add a note about the request path in a downstream brick.
  * Remove some debug prints.
- brick_server:
  * Change top-level 'if' to function clauses: sweep_zone_convert/1
    and op_type_permitted_by_role_p/2.
  * Misc code reformat, tweak record syntax, replace == and /=
    with =:= and =/=.
  * Remove some debug prints.
- gmt_hlog:
  * Remove experimental rename op DB related functions:
    create_rename_op_db/1, get_rename_op_db/1, delete_rename_op_db/1,
    do_create_rename_op_db/1, do_get_rename_op_db/1, do_delete_
    rename_op_db/1 and remane_op_db_dir/0; updated handle_call/3.
- gmt_hlog_common:
  * Remove rename op DB related functions: record_rename_ops/4,
    add_rename_op/2 and rename_op_db_key/2.
  * Disabled some debug prints.