special characters in custom attributes

Field with virtual custom attributes  don’t contains associations so it don’t contain “.” as separator

it has always form:

<Model>-virtual_custom_attribute_<name_of_attribute>

After this  we need to escape it back because there was dynamic method created with unescaped form,
and such method will be called in evaluation.

before:
ns= ‘/virtual/parent_resource_pool/name’
predicate = ns.split("/")
=> ["", "virtual", "parent_resource_pool", "name"]
predicate = ns.split(“/“)[2..-1] # throw away /virtual
=> ["parent_resource_pool", "name"]

after: (same)
ns= ‘/virtual/parent_resource_pool/name’
ns.gsub!("/virtual/","")  # throw away /virtual
=> ‘parent_resource_pool/name’
predicate = ns.split("/")
=> ["parent_resource_pool", "name"]

…acters

now there is allowed to have special characters as `-` and `.` `/`