Changes

pySim-shell_test/utils: delete log files in general

When we get rid of temporary files, we delete those using a wildcard,
but for the logs from pySim-shell we explicitly memorize the name
of the pySim-shell logfile and delete it later by this explicit
name. This is not necessary, let's just delete all log files present
using a wildcard.

Related: OS#6601
Change-Id: I09dc7e59d1a3dcb68f54e3a8dccb86a1bc6c9ee6

pySim-shell_test/utils: enumerate pySim-shell logs

When pySim-shell is called by a testcase, a logfile is createted. The logfile
filename contains the testcase name. However, a testcase may run pySim-shell
multiple times. In this case we overwrite the log from previous run. Let's use a
counter to generate unique file names for each run, so that we won't lose logs
from previous runs.

Related: OS#6601
Change-Id: Ib2195d9b2231f74d0a6c4fb28f4889b6c45efb1e

pySim-shell_test/utils: display pySim-shell logfile content

When we configure the tests to display file content, we only display files that
we compare, let's also display log file contents from pySim-shell. This will
be useful in situations where we only have log output from the tests, but no
access to the file system of the test host.

Related: OS#6601
Change-Id: Ibf6f78d7e71c213c7ca1caaf21c4c890e892261e