adblock-fast: update to 1.2.0-r20

adblock-fast: update to 1.2.0-r20

Config file:
* add debug_init_script and debug_performance options
* remove led (default should be empty) option
* remove procd_boot_delay (obsolete) option

Init Script:
* reinstate IPKG_INSTROOT check
* change capitalization in status messages
* unset default value for led option on load_package_config
* bugfix: unset bool options which are later checked for non-empty
* bugfix: create compressed cache only if block-file exists
* adjust errors output/storing errors for later display in multuple cases
* produce information about cache/compressed cache files in service
  status output when service is stopped
* attempt to create compressed cache in service_started only if block-
  file exists
* bugfix: run service_started from the dl command (to create compressed
  cache file)
* rename StripToDomains variables for readability
* improve open port detection

Uci-Defaults:
* improve readability of debug options migration

Signed-off-by: Stan Grishin <[email protected]>
(cherry picked from commit ff2a55441d1ce54c0a726359475f0e0dfaa374e6)