[api] disallow project and packages with the name "0"

backend is not allowing it. People can trap themself by
creating it without a way to remove it.

src/api/app/models/package.rb

@@ -988,6 +988,7 @@ def self.valid_name?(name)
     return false unless name.kind_of? String
     # this length check is duplicated but useful for other uses for this function
     return false if name.length > 200 || name.blank?
+    return false if name == "0"
     return true if name =~ /\A_product:\w[-+\w\.]*\z/
     # obsolete, just for backward compatibility
     return true if name =~ /\A_patchinfo:\w[-+\w\.]*\z/

src/api/app/models/project.rb

@@ -1407,6 +1407,7 @@ def self.valid_name?(name)
     return false unless name.kind_of? String
     # this length check is duplicated but useful for other uses for this function
     return false if name.length > 200 || name.blank?
+    return false if name == "0";
     return false if name =~ %r{^[_\.]}
     return false if name =~ %r{::}
     return false if name.end_with?(':')