Remove user creation in object service and healthcheck test

To test basic object services and healthcheck middleware it is not
required to create a test user.  By removing this code, it is now
possible to run this test without an administrator account if
allow_tenant_isolation is set to False.

Change-Id: I475e59572729a826739bedb809b8ab5bbd746861
stop validating user IDs on role assignment operations

Keystone is proposing to change it's behavior regarding user & group ID
validation on role assignment operations in order to establish full
isolation between the assignment and identity interfaces, which were
split apart during havana.

Change-Id: Id0549d6b26f348f6029c238adfcb4d8dc47be316
Implements: bp no-check-id
Increase ping timeout from 60 to 120 seconds

The Cirros image only sends out three DHCPDISCOVERs with 60 second
waits between. The ovs_neutron_agent may not have the port wired in
time for the first one, and with ping_timeout=60 the test will be
terminated before the second one is sent. This patch increases the
timeout to 120 seconds to prevent that.

Change-Id: I03fcec50b91fd89ad64e16fce82f9211c2e086a1
Partial-Bug: 1253896
Separate negative tests for Swift

Move negative tests in Swift to their own file.

Partially implements blueprint negative-test-files

Change-Id: If7c42acdbc58107b7fcd6eef979d426935304a76
Merge "Remove user creation in object service and healthcheck test"
Merge "Increase ping timeout from 60 to 120 seconds"
Merge "stop validating user IDs on role assignment operations"
Merge "Separate negative tests for Swift"