Add validation to service binding model for syslog drain url

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
Cleaning up a bad merge arifact

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
add positive case for syslog_drains and refactor

Signed-off-by: Glenn Oppegard <goppegard@pivotallabs.com>