Adds XML namespace example for disk config extension

Adds XML namespace and specifying of the disk config value
to the disk config extensions api sample test data for server
creation. This is being done so the api samples used by the
documentation contain the example of this usage.

DocImpact

Change-Id: Icd7aa3743f71dd1cb8575605e5f1ce5da6bd37bf
Closes-Bug: 1189817
Remove unused local variable in test_compute

Local variable 'volume' is assigned but never used in test_compute.py

Change-Id: If4630e6ee45b03bd743e42aad018ec31984091be
Fix type mismatch errors in NetworkTestCase

A few tests of NetworkTestCase use string literals as
network_id values. This works great when running tests
on both SQLite and MySQL, but fails on PostgreSQL, which
is very string when checking data types.

Blueprint: db-api-tests-on-all-backends

Change-Id: I090e42ff045379ac404e7bc5c91fbc82a52920b0
Reverse the quota reservation in revert_resize

If concurrent revert_resize requests happen, the second request
will fail because of save failure. In such situation, we should
revert the reservation.

Change-Id: I90f4189ec385ea323e62312e519ae65ec58cca66
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Merge "Adds XML namespace example for disk config extension"
Merge "Fix type mismatch errors in NetworkTestCase"
Merge "Reverse the quota reservation in revert_resize"
Merge "Remove unused local variable in test_compute"