client: dispatch pending events before sending request

Before we get display's attention (kick_display), dispatch pending
requests.
tests: fix wit-test

Previous commit broke wit-test, because we hadn't have display's proxy
in client's structure before.
autogen: add benchmarks directory

Test if test/benchmarks directory exists and if it not, create it.
This directory will be used to save tests benchmarks (how long single
test runs)
autotools: clean benchmarks

clean test/benchmarks directory on make clean
test-runner: do benchmarks of test

Measure how long test runs and add it into
benchmarks/test_name.benchmark
test-runner: add timestamp to benchmark

So that we can see when the test ran
test-runner: print name of failed benchmark
server: rename macro

rename macro for running user function to go with optype