selftests: rds: Log collection, TAP compliance and cleanups

This series is a set of bug fixes and improvements for the rds
selftests.

Patch 1 bumps the kselftest timeout from 400s to 800s. The original
limit was developed against a lean config, but the kselftest harness
counts boot time and gcov log collection against the limit, so a
default config with gcov enabled needs more headroom. Patch 2 removes
an unused "-g" entry in run.sh's USAGE string, and patch 3 adds a -t
flag to run.sh so the timeout can be overridden if needed.

Patch 4 fixes log collection under vng. The vng guest inherits the
host's systemd config, so tmp and debugfs may not be mounted by
default; without them tcpdump can't write pcaps and gcov data is
silently dropped. The patch mounts each filesystem when it isn't
already mounted, and also specifies the --root folder so that gcov
can still find the kernel source when it is run from the ksft
test directory.

Patch 5 hoists pcap collection into a helper and calls it from the
timeout signal handler so dumps are preserved when a test times out.
Patch 6 makes the test output TAP compliant so the kselftest runner
parses results correctly.

Questions, comments and feedback appreciated!

Thanks everyone!
Allison

Allison Henderson (6):
  selftests: rds: Increase selftest timeout
  selftests: rds: Update USAGE string for run.sh
  selftests: rds: Add timeout flag to run.sh
  selftests: rds: Fix gcov and pcap collection
  selftests: rds: Collect pcaps on timeout
  selftests: rds: Make rds selftests TAP compliant

 tools/testing/selftests/net/rds/run.sh   | 42 ++++++++++----
 tools/testing/selftests/net/rds/settings |  2 +-
 tools/testing/selftests/net/rds/test.py  | 70 +++++++++++++++---------
 3 files changed, 76 insertions(+), 38 deletions(-)

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2.25.1