Modify loader.conf to catch up to FreeBSD 10 changes for displaying logo and brand.

(cherry picked from commit 0bfb06a58e4f0567d0e98b8f49e3c7ebdda062d8)
Match the code.
Migration must not enable LZ4 compression unconditionally.  Without this
the replication would be broken if the remote side was not upgraded.
Revert "Migration must not enable LZ4 compression unconditionally.  Without this"

This reverts commit b79e6ef57b9eb8ff0a1c82cd96b0dbb45f6ddf79.
Correctly change the migration.
Merge branch 'master' into freebsd10