Fix empty results from S09 because of "grep: Argument list too long"

[gluesmith2021]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Bug fix

• What is the current behavior? (You can also link to an open issue here)

On a firmware that generates a sizable number of files (e.g. 13,000) under s09_firmware_base_version_check/strings_bin, S09 module fails to grep data from them and does not return any result overall.

Cause: the grep command (in the modified line in this PR) has its file pattern extended on the command line with all matching files. This exceeds the system maximum command-line length (2MB on my system, don't know how standard that is). The command does not return anything to stdout, as if no string matched lVERSION_IDENTIFIER.

Error was found by logging grep result, including stderr, from that location:

    lGREP_RESULT=$(grep -a -o -E -l "${lVERSION_IDENTIFIER}" "${LOG_PATH_MODULE}"/strings_bins/strings_* 2>&1)
    print_output "[*] DBG ${lGREP_RESULT}" 

This logs DBG /usr/bin/grep: Argument list too long for every lVERSION_IDENTIFIER

• What is the new behavior (if this is a feature change)? If possible add a screenshot.

Given that this folder only contains strings_* files, we can call grep on the whole folder with the -r option. Results are now returned as expected from this command.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

No

• Other information:

None

[m-1-k-3]

Thank you for fixing this nasty bug

[gluesmith2021]

Thanks for the quick merge!