[request-tracker-maintainers] Bug#851986: rt-extension-sla: Obsolete with RT 4.4

[Dominic Hargreaves]

Source: rt-extension-sla
Version: 1.04-2
Severity: serious
Justification: obsolete, uninstallable

With the upload of RT 4.4 to unstable, this separate package is
obsoleted - RT 4.4 includes the SLA functionality out of the box. As
such, rt-extension-sla should not be released with stretch.

Dominic.