Description of problem:
Cartridges show up in the output of `oo-admin-cartridge -a list` even after I've removed them using `oo-admin-cartridge -a erase`.


Version-Release number of selected component (if applicable):
Origin HEAD.


How reproducible:
Tried with three cartridges.


Steps to Reproduce:
1. Run `oo-admin-cartridge -a list`.
2. Run `oo-admin-cartridge -a erase -n cron -v 1.4 -c 0.0.4`.
3. Run `oo-admin-cartridge -a list` again.


Actual results:
# oo-admin-cartridge -a list
(redhat, diy, 0.1, 0.0.3)
(redhat, php, 5.3, 0.0.3)
(redhat, mongodb, 2.2, 0.2.1)
(redhat, jbossas, 7, 0.0.4)
(redhat, cron, 1.4, 0.0.4)
(redhat, perl, 5.10, 0.0.3)
(redhat, mock, 0.1, 0.0.1)
(redhat, mock, 0.2, 0.0.1)
(redhat, zend, 5.6, 0.0.3)
(redhat, jenkins, 1, 0.0.3)
(redhat, phpmyadmin, 3, 0.0.3)
(redhat, nodejs, 0.6, 0.0.3)
(redhat, haproxy, 1.4, 0.0.4)
(redhat, jbossews, 1.0, 0.0.4)
(redhat, jbossews, 2.0, 0.0.4)
(redhat, mock-plugin, 0.1, 0.0.1)
(redhat, jbosseap, 6, 0.0.4)
(redhat, 10gen-mms-agent, 0.1, 0.0.2)
(redhat, python, 2.6, 0.0.4)
(redhat, python, 2.7, 0.0.4)
(redhat, python, 3.3, 0.0.4)
(redhat, postgresql, 8.4, 0.3.1)
(redhat, postgresql, 9.2, 0.3.1)
(redhat, switchyard, 0, 0.0.3)
(redhat, ruby, 1.8, 0.0.5)
(redhat, ruby, 1.9, 0.0.5)
(redhat, metrics, 0.1, 0.0.2)
(redhat, jenkins-client, 1, 0.0.2)
(redhat, mysql, 5.1, 0.2.1)
(redhat, rockmongo, 1.1, 0.0.2)
# oo-admin-cartridge -a erase -n cron -v 1.4 -c 0.0.4
succeeded
# oo-admin-cartridge -a list
(redhat, diy, 0.1, 0.0.3)
(redhat, php, 5.3, 0.0.3)
(redhat, mongodb, 2.2, 0.2.1)
(redhat, jbossas, 7, 0.0.4)
(redhat, cron, 1.4, 0.0.4)
(redhat, perl, 5.10, 0.0.3)
(redhat, mock, 0.1, 0.0.1)
(redhat, mock, 0.2, 0.0.1)
(redhat, zend, 5.6, 0.0.3)
(redhat, jenkins, 1, 0.0.3)
(redhat, phpmyadmin, 3, 0.0.3)
(redhat, nodejs, 0.6, 0.0.3)
(redhat, haproxy, 1.4, 0.0.4)
(redhat, jbossews, 1.0, 0.0.4)
(redhat, jbossews, 2.0, 0.0.4)
(redhat, mock-plugin, 0.1, 0.0.1)
(redhat, jbosseap, 6, 0.0.4)
(redhat, 10gen-mms-agent, 0.1, 0.0.2)
(redhat, python, 2.6, 0.0.4)
(redhat, python, 2.7, 0.0.4)
(redhat, python, 3.3, 0.0.4)
(redhat, postgresql, 8.4, 0.3.1)
(redhat, postgresql, 9.2, 0.3.1)
(redhat, switchyard, 0, 0.0.3)
(redhat, ruby, 1.8, 0.0.5)
(redhat, ruby, 1.9, 0.0.5)
(redhat, metrics, 0.1, 0.0.2)
(redhat, jenkins-client, 1, 0.0.2)
(redhat, mysql, 5.1, 0.2.1)
(redhat, rockmongo, 1.1, 0.0.2)


Expected results:
The line "(redhat, cron, 1.4, 0.0.4)" should be gone from the output of `oo-admin-cartridge -a list` after Step 3.