The API generators rely on the Name and Prefix fields of the
EndpointGroup type to generate code.
Conventional naming code requires using upper or lower case for types,
functions, etc, however requiring the user to set this fields with the
correct casing seems cumbersome for them because they can be adjusted
depending where those values are used on the generated code.
This commit lifts the restriction for the user and adjust the casing of
them according to where they are used.
Change-Id: I700a879d13b4789b4d6ba0519b4d7508061eac73
3193ff9155