docker image DISABLE_SECURITY env variable as helm variable

[unixime]

added new variable disableSecurity : this variable allows disabling the security features as described on README.md file of docker image.

To install the chart with the release name my-release without security features:

helm install activemq-artemis/activemq-artemis --name my-release --set disableSecurity=true

[grkar]

Hi Team,
Could you please upload license file for this project, as i am using this for my company project, which needs a license file. Apche license is also preferable.

Thanks
Gyana

[erlisb]

Hello @vromero ,

Does this PR passes all the requested tests ?
We need to use this feature in our deployment.

Thanks,
eb