Don't number the plugins (#1146)

* Don't number the plugins

The number is not needed, because the ordering is already specified.
It's also annoying when you move plugins, because you need to renumber
them. Remove this.

'go gen' shows no changes in the generated files, meaning this just
works.

* better naming

plugin.cfg

@@ -10,42 +10,42 @@
 # Modify the list below and run `go gen && go build`
 
 # The parser takes the input format of
-#     <order>:<plugin-name>:<package-name>
+#     <plugin-name>:<package-name>
 # Or
-#     <order>:<plugin-name>:<fully-qualified-package-name>
+#     <plugin-name>:<fully-qualified-package-name>
 #
 # External plugin example:
-# 80:log:github.com/coredns/coredns/plugin/log
+# log:github.com/coredns/coredns/plugin/log
 # Local plugin example:
-# 80:log:log
+# log:log
 
-1:tls:tls
-10:root:root
-20:bind:bind
-30:debug:debug
-40:trace:trace
-50:health:health
-60:pprof:pprof
-70:prometheus:metrics
-80:errors:errors
-90:log:log
-100:autopath:autopath
-110:dnstap:dnstap
-120:chaos:chaos
-130:cache:cache
-140:rewrite:rewrite
-150:loadbalance:loadbalance
-160:dnssec:dnssec
-170:reverse:reverse
-180:hosts:hosts
-190:federation:federation
-200:kubernetes:kubernetes
-210:file:file
-220:auto:auto
-230:secondary:secondary
-240:etcd:etcd
-250:proxy:proxy
-260:erratic:erratic
-270:whoami:whoami
-500:startup:github.com/mholt/caddy/startupshutdown
-510:shutdown:github.com/mholt/caddy/startupshutdown
+tls:tls
+root:root
+bind:bind
+debug:debug
+trace:trace
+health:health
+pprof:pprof
+prometheus:metrics
+errors:errors
+log:log
+autopath:autopath
+dnstap:dnstap
+chaos:chaos
+cache:cache
+rewrite:rewrite
+loadbalance:loadbalance
+dnssec:dnssec
+reverse:reverse
+hosts:hosts
+federation:federation
+kubernetes:kubernetes
+file:file
+auto:auto
+secondary:secondary
+etcd:etcd
+proxy:proxy
+erratic:erratic
+whoami:whoami
+startup:github.com/mholt/caddy/startupshutdown
+shutdown:github.com/mholt/caddy/startupshutdown