Added implementation of C_SeedRandom and C_GenerateRandom.

BUG=chromium-os:20415,chromium-os:20587
TEST=make runtests
     manual tests on x86-zgb
     > sudo /usr/sbin/chapsd libopencryptoki.so &
     > ./chapsd_test --use_dbus
     > ./chapsd_test

Change-Id: Id6b3c64f578fa5b531a33c338a7a178c705333ab
12 files changed