misc_radius: new parameter common_response

- get the radius response specific attributes in avps
- patch by Victor V. Kustov
misc_radius: documented common_response parameter
pv: clone result of several string transformations

- it is safer for assigning back to the same variable on which the
  transformation was applied
- reported by Martin Mikkelsen
modules/uac: avoid adding double quotes in uac_replace_* functions

- updated uac doc with a note and examples.
modules:uac updated README after avoiding quotes in display.
Fix ul.dump q output value
modules/usrloc: use 6th param to set the contact path
utils/kamctl: Add contact path parameter