security-sig: add draft agenda for 2017-06-07 meeting

Signed-off-by: Riyaz Faizullabhoy <riyaz.faizullabhoy@docker.com>

reports/sig-security/2017-06-07.md

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+# 2017-06-07
+Time: **9am PDT** (12pm EDT, 5pm BST) [see the time in your timezone](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Linuxkit+Security+SIG&iso=20170607T09&p1=224)
+
+Meeting location: https://docker.zoom.us/j/779801882
+
+Announcement: Moby project forum post coming soon!
+
+Previous meeting notes: [2017-05-24](2017-05-24.md)
+
+## Agenda
+- Introductions & Administrivia
+- RFC on `"probational"`/`"hardened"`/`"staging"` channel
+  - proof-of-concept in LinuxKit repo
+  - proposed process for promotion to channel, out of channel
+- Overview of LinuxKit and its security initiatives
+- Discuss goals of SIG
+- `miragesdk` deep dive - @avsm @samoht
+  - What is it?  Why do we care?
+  - RFC: which system daemons should we implement?
+  - architecture deep dive
+  - demo: `dhcp`
+- Next meeting: 2017-06-21
+  - landlock demo and deep dive - @l0kod
+  - we can propose additional deep dives and discussion topics!
+
+## Meeting Notes