Use rfc3986 library to validate URL paths and URIs

More work needs to be done in rfc3986 to give the user more control over what
they consider to be a valid URI in the context of RFC 3986. For example, a
previous incarnation of these tests checked that "1" and "abc" were invalid
when according to the RFC they are.

Update the API samples and tests to use valid URIs

DocImpact

Change-Id: I288fbaead64990db1053b7a11e82904611b8498f
Merge "Use rfc3986 library to validate URL paths and URIs"