Allow --java-help as argument to display the Java help

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Test --java-help argument as part of the CLI import unit tests

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Use e.g. rather than ex. across the board

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Merge pull request #2766 from sbesson/cli_import_help_another

CLI import help changes