Fix localrepo and svupdater uninitialized config

Fix updater-supervisor to correctly work with Python3

Fix localrepo to correctly work with Python3

60.4.4: Drop Python 2 usage

* All scripts are now explicitly run in Python3

60.4.3: Fix undefined user_path_move

* Fix undefined function user_path_move (it was invalidly marked as
  local)
* Drop --model and --board options for opkg-trans

60.4.2: Support "Alternative" field of packages

* Added hacky support for "Alternatives" field in packages (this field
  was added in upstream OpenWRT)
* internal:// uri was removed
* Default path to entry configuration changed from
  /etc/updater/entry.lua to /etc/updater/conf.lua
* entry.lua/conf.lua is no longer embedded in pkgupdate and is now
  considered as a standard configuration file.

60.4.1: Fix segfault when no root was provided to pkgupdate

* Fix segfault that happened when no -R option was specified to
  pkgupdate
* Try to set content2localrepo script exit code to zero when there is
  nothing to do
* Cleanup valgrind tests command

60.4: Cleanup function and --model and --board

* Added cleanup function (not currently widely used in code base but
  it is an important addition)
* Added --model and --board arguments for respective variables override
* Some small INFO prints extension

60.3.3: Try to fix exit code of updater-ng-opkg postupdate

60.3.2: Add support for Mox to base configuration script

60.3.1: Fix segfault on aarch64 (Mox) on md5 calculation

60.3: Code cleanup and fixup release

* Added functions for file hash calculation not requiring data load to
  Lua just for file hash calculation.
* Fix notification type for updater failure (was previously reported as
  update instead of error)
* Fix some of the problems introduced in latest OpenWRT release
* Drop sha256 and md5 implementation and use libcrypto instead
* Other small code and documentation improvements

60.2.4: Add os module to Local security level

60.2.3: Fix opkg lock detection in supervisor

* Fix detection of opkg lock in updater supervisor
* When supervisor is daemonized it also tries to disconnect from ubus

60.2.2: In updater.sh filter out original arguments

60.2.1: Fix migration with approvals with dummy updater.sh

60.2: Handle contract and data collection in updater

60.1: Replace updater.sh with updater-supervisor

* Implement updater-supervisor (Python library and executable in the
  same time intended for non-interactive usage of pkgupdate. It newly
  implements features like approvals or notifications generation. Also
  there are multiple new features such as postrun hooks or ensure run.)
* Obsolete updater.sh (intended replacement for CLI is pkgupdate and for
  automatic task updater-supervisor)
* Use system tools instead of shipped ones for some test cases
* Clean and refactor continuous integration tests

60.0.8: Enable OCSP for Turris repositories

* Enable OCSP for Turris repositories
* Allow abi_change_deep usage from configuration (this is a bug fix)
* Picosat updated to version 650
* Various CI improvements

60.0.7: stdin wasn't passed to pkgupdate using coreutils timeout