Increased diamond version in requirements.txt
Increased diamond version in requirements.txt

This is to fix the error
"No distributions at all found for python-configobj"
when using lower version of diamond.

Corresponding diamond issue:
https://github.com/BrightcoveOS/Diamond/issues/462

Signed-off-by: Kanagaraj M <a744b691cd98174fb19a473a8cf78b810491e452@redhat.com>

r0h4n/ceph-integration