Make sure .txt files are not identified as crashed test

Make sure .txt files are not identified as crashed test

Previously .txt files with full backtrace may be identified as a
crashed test:

    I:Core dumps were found for the following system tests:
    I:	 core.19948-backtrace.txt
    I:   shutdown

Now .txt files are removed from the list.

Change 'run.sh.in' to match the core matching pattern in
'testsummary.sh'.

(cherry picked from commit c2dcd9596697e768626d9cbc417467e399ceae3e)
(cherry picked from commit 01119ac4f97b492ed2a87fdedabd739a33513d5c)