Data integrity: bump to cz 0.16.1, adjust sync mode.

[jglogan]

• 0.16.1 changes an ext4 superblock setting that might have been causing problems.
• Fixes translation from Filesystem props to Mount runtimeOptions. #877 fixed an issue where the cache and sync settings for block filesystems weren't being passed down to the VZ virtual machine configuration. The default sync value getting passed down is full, which reduces I/O performance. Relax this to use fsync for now.

Type of Change

• [*] Bug fix
• New feature
• Breaking change
• Documentation update

Motivation and Context

May address problems reported in #877.

Testing

• Tested locally
• Added/updated tests
• Added/updated docs