Add global random seed config

This is needed to make fuzzy tests work with xdist as each
xdist gateway expects to receive the same set of parameter
values, which for random generators may be achieved only by
providing globally shared seed.

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

tests/functional/Makefile

@@ -18,7 +18,7 @@ SRC=$(shell find $(SRCDIR) $(WRAPDIR) -name \*.c)
 OBJS=$(patsubst %.c, %.o, $(SRC))
 OCFLIB=$(ADAPTERDIR)/libocf.so
 
-all: | sync
+all: | sync config_random
 	$(MAKE) $(OCFLIB)
 
 $(OCFLIB): $(OBJS)
@@ -36,6 +36,9 @@ sync:
 	@$(MAKE) -C $(OCFDIR) src O=$(ADAPTERDIR)/ocf
 	@$(MAKE) -C $(OCFDIR) env O=$(ADAPTERDIR)/ocf OCF_ENV=posix
 
+config_random:
+	@python3 utils/configure_random.py
+
 clean:
 	@rm -rf $(OCFLIB) $(OBJS)
 	@echo "  CLEAN "
@@ -46,4 +49,4 @@ distclean: clean
 	@rm -rf $(INCDIR)/ocf
 	@echo "  DISTCLEAN "
 
-.PHONY: all clean sync distclean
+.PHONY: all clean sync config_random distclean