light: rename throttling parameters and defaults
test_suite: current state

Signed-off-by: Thomas Schoebel-Theuer <schoebel@bell.site>
if: fix amount of throttling
infra: make limiter max_delay settable
infra: fix limiter overflow in denominator
infra: make limiter {min,max}_window configurable
infra: show ops count in limiter
infra: fix delay computation in limiter
doc: describe throttling
all: release light0.1beta0.15
trans_logger: fix potential race
infra: show version tags in /proc/sys/mars/version
tests: Documentation and minor bugs