dmcrypt support / osd disk encryption support

related prod:
PROD-15919

Change-Id: I80c84b8bd7df45959d4a6dc1bbc643d0df4720fe
diff --git a/README.rst b/README.rst
index 0f90573..3a0abd2 100644
--- a/README.rst
+++ b/README.rst
@@ -316,6 +316,7 @@
               journal: /dev/ssd
               class: bestssd
               weight: 1.5
+              dmcrypt: true
             - dev: /dev/sdl
               journal: /dev/ssd
               class: bestssd
@@ -328,6 +329,7 @@
               block_wal: /dev/ssd
               class: ssd
               weight: 1.666
+              dmcrypt: true
             - dev: /dev/sdd
               enabled: false