Bug 454033: MailUtility: use MimeUtility.encodeText when setting

FileName for FileDataSource

Change-Id: I67f49bf8076a3f071cd0c7b651b1c535e7e83ad0
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=454033
Reviewed-on: https://git.eclipse.org/r/37571
Tested-by: Hudson CI
Reviewed-by: Judith Gull <jgu@bsiag.com>
Reviewed-on: https://git.eclipse.org/r/37633
447597: TestingCodeService constructor with ellipsis 

Change-Id: I1c970c67464e45ea83af24a292eff9f11b7597e4
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=447597
Signed-off-by: Otmar Caduff <otmar.caduff@bsiag.com>
Reviewed-on: https://git.eclipse.org/r/37596
Tested-by: Hudson CI
Reviewed-by: Judith Gull <jgu@bsiag.com>