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 c2dcd95966)

bin/tests/system/run.sh

@@ -259,7 +259,7 @@ else
 fi
 
 get_core_dumps() {
-    find "$systest/" \( -name 'core*' -or -name '*.core' \) ! -name '*.gz' ! -name '*.txt' | sort
+    find "$systest/" \( -name 'core' -or -name 'core.*' -or -name '*.core' \) ! -name '*.gz' ! -name '*.txt' | sort
 }
 
 core_dumps=$(get_core_dumps | tr '\n' ' ')