tests: fixes for gating tests
* plans/ci: setting "how: beakerlib" in execute step is deprecated.
changed to "how: tmt" to comply with newer tmt versions.
tmt versions.
* ltrace with both --o and --c does not produce output to file:
add malloc to the list of syscalls to check for tracing.
* ltrace crashes when run on certain processes with --S option:
make pgrep to exact match to avoid getting two PIDs, one from
dbus-broker and other from dbus-broker-launch.
* ltrace doesn't work on PIE-binaries:
Added missing 32-bit dependencies.