[IOT-1513] Incorrect URI construction

[IOT-1513] Incorrect URI construction

The % character is not legal to be placed literally in a URI, it must be
escaped (as "%25") before being enclosed in a URI.  Other places were
changed in July in change 9419, and some more in change 14009, but these
code paths were not changed at that time.

This also fixes a bug in setHost which did not mark an IPv6 address as
IPv6, and adds a test case that covers this.

Change-Id: I1331ecb9c5482a2d43dd675978a1f34c6d37cb4c
Signed-off-by: Dave Thaler <dthaler@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14273
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-by: Larry Sachs <larry.j.sachs@intel.com>
Reviewed-by: Rick Bell <richard.s.bell@intel.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>