Increase CephFS backing file size

The backing file constitutes to the disk space
on the fake OSDs created.

In an effort to fix bug #1890833 we realized
that more space is needed to run manila tempest
tests at a high concurrency.

Change-Id: Ic96b65d2caab788afca8bfc45575f3c05dc88008
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>
1 file changed