restapi: Remove leading / from RSDL action names

The action names in the RSDL metadata files contain leading slashes.
Durign generation of the RSDL document these are compared to the
generated links, which are relative, they don't have slashes. As a
result the generated RSDL document doesn't contain the information
extracted from the metadata file.

Change-Id: I37a39943f23406a3e6c077317c0b5159f85626f6
Bug-Url: https://bugzilla.redhat.com/1102772
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>
(cherry picked from commit 5723ef221dd9f3ea4dc2e10eecf1ae8576cd7e08)