This is a sanity test cleanup to handle a known image bug with (N9K) I7 images.
The I7 image fails to enable some snmp trap link configs causing an idempotency failure in the sanity, so we're skipping the idempotence tests that involve this bug.
Tested on N9K images: 9.2(2), 7.0(3)I7.
* I seem to have forgotten the back half of tests
* Set http timeout from persistent_command_timeout
* Tweak URL generation and provide URL on error
* Push var_options to connection process
* Don't wait forever if coming from persistent
* Don't send the entire contents of variables to ansible-connection
