plugin/kubernetes: fix reload panic (#4881)
plugin/kubernetes: fix reload panic (#4881)

* fix reload panic

Signed-off-by: Chris O'Haver <c8d69f6e0f4a592980d82af78b0efddff3dcc387@infoblox.com>

* add comment

Signed-off-by: Chris O'Haver <c8d69f6e0f4a592980d82af78b0efddff3dcc387@infoblox.com>

* o import ordering

Signed-off-by: Chris O'Haver <c8d69f6e0f4a592980d82af78b0efddff3dcc387@infoblox.com>
chrisohaver/coredns,yongtang/coredns,coredns/coredns