Add system property for skipping OFT

[kaklakariada]

Is your feature request related to a problem? Please describe.
Sometimes it is necessary to skip running OFT during development. The Maven plugin should support a system property that skips running OFT.

Describe the solution you'd like
A system property allows skipping OFT from the command line.

Describe alternatives you've considered
Removing the plugin from the pom is too cumbersome.