remove SL4/SL5 PARTEDEXTRA code, fix on always using 'u MB'
use parted with 'u MB' also in other places
fix mock commands to use 'u MB' where appropriate
adjust all unittests with new PARTEDEXTRA set to 'u MB'
allow to specify a filesystem type to be checked
fix pod
more strict regexps
tests for has_filesystem
formatfs tests
add tests with create_if_needed (factored out the is_create_needed part)
also fix bug with regex in has_filesystem
fix last fail also (wrong file input)