test: wire test_tpm2_getrandom_func.sh to test_all.sh

The test was broken since commit 6dba52d ("tpm2_getrandom: update
help and simplify interface"), but nobody noticed since wasn't executed
by the Travis CI. Add the test the test_all.sh set so it has coverage.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

test/system/test_all.sh

@@ -63,6 +63,7 @@ test_wrapper test_tpm2_takeownership_all.sh
 test_wrapper test_tpm2_nv.sh
 test_wrapper test_tpm2_pcrlist.sh
 test_wrapper test_tpm2_getrandom.sh
+test_wrapper test_tpm2_getrandom_func.sh
 #test_wrapper test_tpm2_createprimary_all.sh
 #test_wrapper test_tpm2_create_all.sh
 test_wrapper test_tpm2_load.sh