arch/*py: split long lines

Per PEP8: "Limit all lines to a maximum of 79 characters."
arch/*py use relative imports

Uses the syntax defined in PEP328 for import relative modules
arch/*py: remove unused imports

catalyst_support and os where not being used, so there was no reason to
import them
arch/*py: Fix blank lines

per PEP8:
"Separate top-level function and class definitions with two blank
lines."