Bump version to 1.5.2 (#2969)

Run through the motions; create manual pages. Run go generate for good
measure. Fix typo in Makefile.release while at it.

Signed-off-by: Miek Gieben <miek@miek.nl>

man/coredns-etcd.7

@@ -1,5 +1,5 @@
 .\" Generated by Mmark Markdown Processer - mmark.nl
-.TH "COREDNS-ETCD" 7 "April 2019" "CoreDNS" "CoreDNS Plugins"
+.TH "COREDNS-ETCD" 7 "July 2019" "CoreDNS" "CoreDNS Plugins"
 
 .SH "NAME"
 .PP
@@ -48,7 +48,6 @@ etcd [ZONES...] {
     path PATH
     endpoint ENDPOINT...
     credentials USERNAME PASSWORD
-    upstream
     tls CERT KEY CACERT
 }
 
@@ -68,10 +67,6 @@ queries for those zones will be subject to fallthrough.
 .IP \(bu 4
 \fB\fCcredentials\fR is used to set the \fBUSERNAME\fP and \fBPASSWORD\fP for accessing the etcd cluster.
 .IP \(bu 4
-\fB\fCupstream\fR upstream resolvers to be used resolve external names found in etcd (think CNAMEs)
-pointing to external names. If you want CoreDNS to act as a proxy for clients, you'll need to add
-the \fIforward\fP plugin.
-.IP \(bu 4
 \fB\fCtls\fR followed by:
 
 .RS
@@ -120,7 +115,6 @@ This is the default SkyDNS setup, with everything specified in full:
     etcd skydns.local {
         path /skydns
         endpoint http://localhost:2379
-        upstream
     }
     prometheus
     cache 160 skydns.local
@@ -142,7 +136,6 @@ when resolving external pointing CNAMEs.
 \&. {
     etcd skydns.local {
         path /skydns
-        upstream
     }
     cache 160 skydns.local
     forward . /etc/resolv.conf