rework @crashing_NM_binary test
Implement some ideas of @thaller:
- do not use abrt, just coredump
- do not compile crashing C code, use
pkill -SIGSEGV NetworkManager
Also, remove "grep" for crash in runtest.sh, do assert at the end of
after_scenario()
instead.
Move test at the end of testsuite in mapper, so it is last test executed (and log is not spammed with "Examining crash..." messages).