Commit 2f6b1c6890cf7ea6b0dd33ac219646e4dcaf1fd6 changed the way the
cephfs source path was generated and dropped the source path component,
keeping only the list of IPs and ports. This results in failures to
mount cephfs with the following message:
source mount path was not specified
failed to resolve source
Change-Id: I94d18ec064971870264ae8d0b279564f2172e548
Closes-Bug: #1819502