abrt-gdb-exploitable: x86 factoring-out

No substantial logic changes.
Mostly renaming stuff and moving blocks of code around.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
abrt-gdb-exploitable: first cut of ppc support

v2: Python style fixes

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>