wazo-plugind restrict some characters in the namespace
the plugins namespace and name are going to be used to generate the name of the debian package of the plugin.
The debian package name will have the following format (all lowercase):
Allowing a "-" in the namespace would allow conflicts in debian package names
would both be called wazo-plugind-admin-ui-user-wazo
All other caracters that are not allowed in a debian package name should also be checked in the name and namespace fields.