We only need ecryptfs-utils, as package managers will take care of the
sub-dependencies. Tested on an Ubuntu amphora, installed packages list
was identical.
This also fixes image creation on Fedora, as ecryptfs-utils package name
is identical there
Change-Id: Idab8c66e6bca137e79bef050fbaecd2f6c4add7a
Closes-Bug: #1640832