sudo-install: remove/update in a yum transaction

Plain update does not work if corner cases with changed
architecture etc. Remove existing package + update install
new in single yum transaction using yum shell. Force
update (reinstall) when version is identical, all installs
are basically insteractive and should be done.
scripts: remove LPF_CONSOLE

Not needed anymore, all interactive  code is in the main user context.
install: bugfix: permissions when rm results.
lpf: use sg(1) to change group.
update: bugfix in cli_confirm_update
defs: disable sudo when root (mock)
defs: handle SUDO arguments
scan: don't require user pkg-build.
sudo-install: bugfixes
lpf: states: bugfix: accept package arg
install: allow re-install of same version.
Adding new test cases foo and bar
tests: first iteration

Adding some unitttest. Mostly tcl scripts driven by a python
unittest main program.