Encryption patch follow-up

* PBKDF2 implementation changed to OpenSSL implementation.

* HKDF implementation moved to its own file and tests
  added to ensure correctness.

* Removed libzfs's now unnecessary dependency on libzpool
  and libicp.

* Ztest can now create and test encrypted datasets. This is
  currently disabled until issue #6526 is resolved, but
  otherwise functions as advertised.

* Several small bug fixes discovered after enabling ztest
  to run on encrypted datasets.

* Fixed coverity defects added by the encryption patch.

* Updated man pages for encrypted send / receive behavior.

* Fixed a bug where encrypted datasets could receive
  DRR_WRITE_EMBEDDED records.

* Minor code cleanups / consolidation.

Signed-off-by: Tom Caputi <tcaputi@datto.com>

rpm/generic/zfs.spec.in

@@ -87,6 +87,8 @@ BuildRequires:  libuuid-devel
 BuildRequires:  libblkid-devel
 BuildRequires:  libudev-devel
 BuildRequires:  libattr-devel
+BuildRequires:  openssl-devel
+Requires:       openssl
 %endif
 %if 0%{?_systemd}
 Requires(post): systemd
@@ -183,7 +185,7 @@ Requires:	fio
 Requires:	acl
 Requires:	sudo
 Requires:	sysstat
-Requires:       rng-tools
+Requires:	rng-tools
 
 %description test
 This package contains test infrastructure and support scripts for