[unit] fix string bin/data path processing

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
vault execution tracing

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
unit_path can be also used to get unit dir

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
copy unit tests to temp dir

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
version bump

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>