Return message when database does not exists

[Asia95]

When database for given company and project doesn't exists proper message is displayed.

Description

SuiteStausServlet returns status PROCESSING_ERROR and proper message when database doesn't exists

Motivation and Context

Closes #341

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• I have reviewed (and updated if needed) the documentation regarding this change

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I hereby agree to the terms of the AET Contributor License Agreement.

[tkaik]

It should probably return true also when the database does not exist but the allowAutoCreate flag is set to true :) Please update javadoc. Could you also create some unit tests for this method?

[tkaik]

If this status is only returned when the database does not exist (and can't be created), please rename it to e.g. MISSING_DATABASE

[plutasnyy]

Please update a changelog ;)

[bambroziak]

Tested and accepted.
I've disabled automatic creation of database on AET MongoDB Client in Karaf.
Then I've rebuilded Integration env with branch changes.
Next I've runned AET suite with not existing company and project by aet.sh script on server.
Database was not created and test suite didin't get executed.

"No database found for company: 'companyname', project: 'projectname'." - result is displaying, which is expected. Without changes only timeout display.

QA Covered.