empty string table_prefix fails to connect to Hbase thrift server

[Shengjie Min]

In the case of Hbase storage driver, if no table_prefix is provided, it defaults to empty string '' other than None. The empty string actually fails the connection to the hbase thrift server.

The table_prefix should simply defaults to None.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/27651

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/27651
Committed: http://github.com/openstack/ceilometer/commit/8bcc3773ac0153f69e56508a17abf465d90492a0
Submitter: Jenkins
Branch: master

commit 8bcc3773ac0153f69e56508a17abf465d90492a0
Author: Shengjie Min <email address hidden>
Date: Sun Apr 28 16:43:12 2013 +0100

    Set hbase table_prefix default to None

    ...table_prefix default value was empty string which fails the connection to hbase thrift server. it should be set to None instead...

    Change-Id: I1339c7dad09d311f0a4e3b16d67057e3471e8c5b
    Fixes: bug #1173205

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/grizzly
Review: https://review.openstack.org/28165

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/28165
Committed: http://github.com/openstack/ceilometer/commit/966539af7d3c736b7b2903a7ca81cf277d680456
Submitter: Jenkins
Branch: stable/grizzly

commit 966539af7d3c736b7b2903a7ca81cf277d680456
Author: Shengjie Min <email address hidden>
Date: Sun Apr 28 16:43:12 2013 +0100

    Set hbase table_prefix default to None

    ...table_prefix default value was empty string which fails the connection to hbase thrift server. it should be set to None instead...

    Change-Id: I1339c7dad09d311f0a4e3b16d67057e3471e8c5b
    Fixes: bug #1173205
    (cherry picked from commit 8bcc3773ac0153f69e56508a17abf465d90492a0)