tests/eas: Remove 'acceptance' suite
tests/eas: Remove 'acceptance' suite

This test suite was based on a set of inflexible, big.LITTLE-specific
behaviours. They have been superseded by the more generic and flexible tests in
generic.py and heavy_load.py. Additional funcionality has also been added in
preliminary.py and load_tracking.py. Therefore these tests can be removed in
order to avoid misleading users.

joelagnel/lisa,mdigiorgio/lisa,joelagnel/lisa,credp/lisa,credp/lisa,ARM-software/lisa,ARM-software/lisa,arnoldlu/lisa,mdigiorgio/lisa,bjackman/lisa,credp/lisa,ARM-software/lisa,ARM-software/lisa,arnoldlu/lisa,credp/lisa,bjackman/lisa