spec: use let! instead of let in the repositories controller test
spec: use let! instead of let in the repositories controller test

Signed-off-by: Miquel Sabaté <b4d70704b9e7df580cab34510621dbd0aacb2dfd@suse.com>

krishnak9/Portus,krishnak9/Portus,vpereira/Portus,angry-tony/Portus-20170827,angry-tony/Portus-20170827,mssola/Portus,kwk/Portus,mssola/Portus,SUSE/Portus,SUSE/Portus,jloehel/Portus,vpereira/Portus,SUSE/Portus,jloehel/Portus,mssola/Portus,angry-tony/Portus-20170827,krishnak9/Portus,SUSE/Portus,krishnak9/Portus,angry-tony/Portus-20170827,kwk/Portus,vpereira/Portus,jloehel/Portus,kwk/Portus,mssola/Portus