allow capital letters in tenant names
allow capital letters in tenant names

based on https://github.com/codenvy/cloud-ide/commit/9a6634e39b209665b5eb850cbc0876690903a1b9

codenvy/codenvy,codenvy/codenvy,R-Brain/codenvy,R-Brain/codenvy,R-Brain/codenvy,R-Brain/codenvy,codenvy/codenvy,R-Brain/codenvy,codenvy/codenvy,codenvy/codenvy,codenvy/codenvy,R-Brain/codenvy