Move negative action tests to right place

Negative tests of server should be written on test_servers_negative.py,
but some negative tests are written on positive tests file, then that
would mislead developers who add new negative tests.

This patch moves these negative tests to a right place.

Change-Id: If3ddb2a0a5d27a87d610c6d8e7783d400fd32606
Fixing ImagesOneServerTestXml issue

Now operations started with the server when it's task state was not
None. Ie. Idle / 'ready for action'.

The wait for wait_for_server_status method implicitly waits for the None
task state, it should be able to fix the issue.

The server will be rebuilded if otherwise it cannot be move to a clean active
state, this issue will be logged.
It is an unexpected exception, so the log verifier should be able to
report it.

Fixing bug 1218391

Change-Id: Ib0e90a06e0e34f134bcca74712939e87e235c1ea
Skip negative compute quota tests that don't work with Neutron

Change I5187a109f0bacb1f3afa4276b3d73f47fd53ad87 re-enabled some
negative quota tests for compute but they don't work if you're using
Neutron due to nova bug 1186354.

There is a patch up for the bug here:

https://review.openstack.org/#/c/43822/

but it's taking awhile to land so we should skip the tests until that's
working.

Partial-Bug: #1186354

Change-Id: I0458f8cf95585962638a82da34397071e34a1940
Merge "Fixing ImagesOneServerTestXml issue"
Separate negative tests  api/network/security_groups

moved negative tests cases to a new file

Change-Id: I24438d556231d80b21e033acc79da3a050bf31cb
VPNaas vpnservice test cases

Adding testcases for vpn service create, list, delete, and show
part of blueprint: vpnaas-api-test-cases
Change-Id: I015fd503a198f93bfc7382e30b2aff5c74b3fd30
Merge "Skip negative compute quota tests that don't work with Neutron"
Merge "Move negative action tests to right place"
Merge "VPNaas vpnservice test cases"
Merge "Separate negative tests  api/network/security_groups"
server status remained in unexpected state

Two test case in the test_servers_negative change the 'one' servers
into a stable not active state. We are waiting 2 times 400 sec for
getting active state in vain.
Having those test cases to restore the expected state.

The deleted server related rebuild and reboot test case create are
merged and it creates and deletes one server.

Change-Id: Ie1b9dc62bad2bf7b8595da2c9d6f994c646a0025