Improve Surefire configuration
Improve Surefire configuration

It's better to configure `argLine` as property.
This has the following advantages
a) less LOC required to configure surefire
b) in case JaCoCo also set `argLine` it's not overwritten

jenkinsci/email-ext-plugin,jenkinsci/email-ext-plugin,jenkinsci/email-ext-plugin,jenkinsci/email-ext-plugin