Quote Postgres names to avoid implicit conversion

[Petr Malik]

In PostgreSQL unquoted names are case-insensitive. However, quoted names are case-sensivite.
Unquoted names are implicitly lowercased!

Trove guestagent currently uses unquoted names leading to inproper behavior when the user actually uses names with uppercase letters.

Example:
trove user-create <id> USERNAME <password>
trove user-show <id> USERNAME

results in a 404 error - user not found on instance, because the user created is actually "username".

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/148378

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/148378
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=9ee427d43f0f8a424751e56fc1e62a0633cdc0e9
Submitter: Jenkins
Branch: master

commit 9ee427d43f0f8a424751e56fc1e62a0633cdc0e9
Author: Petr Malik <email address hidden>
Date: Mon Jan 19 17:41:05 2015 -0500

    Quote Postgres names to avoid implicit conversion

    In PostgreSQL unquoted names are case-insensitive.
    However, quoted names are case-sensivite.
    Unquoted names are implicitly lowercased!

    Problem:
    Trove guestagent currently uses unquoted names leading to
    inproper behavior when the user actually uses names
    with uppercase letters.

    Example:
    trove user-create <id> USERNAME <password>
    trove user-show <id> USERNAME

    results in a 404 error - user not found on instance,
    because the user created is actually "username".

    Solution:
    Make sure we quote user provided names and value strings in
    SQL statements in 'guestagent/datastore/postgresql/pgutil.py'.

    Change-Id: I5f86b2b0c0195aafb436a65da03d66e4ff2bf9d6
    Closes-bug: 1412568