ISM Plugin is not functional

[emanoelxavier]

Steps:

1. Upload ISM Manager Plugin - SampleMgrPlugin.bar using Manage/Pulgins/Manager Plugins

2. Add an ISM Manager Connector

3. Remove an ISM Manager Connector

4. Remove the plugin

5. Add the plugin once again

6. Add the ISM MC once again.

Expected Result:
All the steps above should be completed successfully

Actual Result:
There is a DB related issue preventing the plugin from being functional, add MC does not succeed.

Note:
After this bug is fixed it is OK if the ISM plugin still shows INSTALL_WAIT and Services as 0 as long as the plugin is functional. This status issue will be fixed by Intel once the PR opensecuritycontroller/security-mgr-sample-plugin#5 is handled.

[neilxb]

As a quick update - I have identified a probable fix for this problem. However it would cause a further conflict with the database changes in PR #111. Therefore it would be better for me to address your requested updates in that PR and get it merged before adding the fix for this bug on the top. Thanks.

[neilxb]

Fixed by #133