Fix DG calls to use correct rpc name

Fix DG calls to use correct rpc name

DG calls should expect the name of the DG to be the same as the name of
the rpc as defined in the Yang model.  LCM was incorrectly expecting
names in upper camelcase (e.g. UpgradeSoftware) when the Yang
model defines them in lowercase hyphenated (e.g. upgrade-software).  Either
LCM or DGs need to change, so changed LCM since to be consistent with
other MD-SAL applications.

Change-Id: I034bc2d93c2f918c807fec7f342d6197f78be7ad
Issue-ID: CCSDK-272
Signed-off-by: Timoney, Dan (dt5972) <dt5972@att.com>