tests/posix/fs : Dropped console output

[cinlyooi-intel]

Describe the bug
When running the test case, I get

--- 40 messages dropped ---

Please note that the number in the message changes. In general, the ztest test case one is trying to run the larger the number.

To Reproduce
Steps to reproduce the behavior:

1. mkdir build; cd build
2. cmake -DBOARD=nrf52840_pca10056
3. make
4. See error

Impact

• The test harness in testcase.yaml will report that the test case failed. It is relying on finding all the expected Pass - test_fs_xxx lines but cannot get all of them, because a significant number of them are in part of the messages that were deleted.
• Visually, we cannot confirm all test cases passed because we are not seeing all the Pass - test_fs_xxx lines. Instead, we trust Test suite posix_fs_test succeeded to confirm to us that all test passed.

Screenshots or console output

Created dir /RAM:/testdir!
--- 40 messages dropped ---
PASS - test_fs_mkdir
===================================================================
starting test - test_fs_readdir

readdir test:

Listing dir /RAM:/testdir:
[FILE] TESTFILE.TX
PASS - test_fs_readdir
===================================================================
Test suite posix_fs_test succeeded
===================================================================

Environment (please complete the following information):

• OS: fedora29
• Toolchain : zephyr
• Commit SHA or Version used: 5d35b66

[carlescufi]

@cinlyooi-intel this is just a result of a buffer that is too small. You can increase the buffer size with:

CONFIG_LOG_BUFFER_SIZE=4096

in your prj.conf.

Since there are memory constraints in some of the boards I don't want to increase that size for all boards.

[aescolar]

Duplicate: #14903