distros/supported: remove jessie until paramiko issue is resolved

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/distros/supported/debian_8.0.yaml b/distros/supported/debian_8.0.yaml
deleted file mode 120000 (symlink)
index f8c0977..0000000
--- a/distros/supported/debian_8.0.yaml
+++ /dev/null
@@ -1 +0,0 @@
-../all/debian_8.0.yaml
\ No newline at end of file