Docker-compose creates volumes names as an aggregate of the project name
and the requested volume, but uses '_' to compose the name. SolidFire doesn't
support volume names with '_' so this patch replaces the '_' with '-' such
that the Docker-Compose volumes can be supported on SolidFire.
This is a change only in the SolidFire section of the code but worth nothing that ONTAP and E-Series have the opposite problem, they support underscore '_' but not hyphen '-'.
SolidFire does not support '_' in volume names