Left over master branch pychecker warnings

[Hans de Goede <hdegoede redhat com>]

Hi,

Here is a list of warnings which pychecker gives where I'm not sure what todo 
with them (fix the code or mark them as false positives), once this list is 
cleared (and the textmode scp issue is fixed). We're down to 0 complaints from 
pychecker after filtering.

isys/isys.py:898: Function return types are inconsistent
autopart.py:201: Using integer division (start / 1024) may return integer or float
installclass.py:60: Methods (createbug, getbug, getbugs, getversion, login, 
query) in AbstractFiler need to be overridden in a subclass
iscsi.py:319: string.atoi is deprecated
iw/lvm_dialog_gui.py:91: Using integer division (pesize / 1024) may return 
integer or float
iw/lvm_dialog_gui.py:282: string.atoi is deprecated
iw/partition_ui_helpers_gui.py:51: Comparisons with True are not necessary and 
may not work as expected
network.py:697: Using is not , may not always work
rescue.py:82: Function return types are inconsistent
text.py:461: Function return types are inconsistent

Regards,

Hans