Use AWS_DNS_SLOWRATE env variable instead of arg

dnsapi/dns_aws.sh

@@ -18,7 +18,7 @@ AWS_WIKI="https://github.com/Neilpang/acme.sh/wiki/How-to-use-Amazon-Route53-API
 dns_aws_add() {
   fulldomain=$1
   txtvalue=$2
-  slowrateslepp=$3
+  slowrateslepp=$AWS_DNS_SLOWRATE
 
   AWS_ACCESS_KEY_ID="${AWS_ACCESS_KEY_ID:-$(_readaccountconf_mutable AWS_ACCESS_KEY_ID)}"
   AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
@@ -87,6 +87,7 @@ dns_aws_add() {
 dns_aws_rm() {
   fulldomain=$1
   txtvalue=$2
+  slowrateslepp=$AWS_DNS_SLOWRATE
 
   AWS_ACCESS_KEY_ID="${AWS_ACCESS_KEY_ID:-$(_readaccountconf_mutable AWS_ACCESS_KEY_ID)}"
   AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
@@ -121,6 +122,10 @@ dns_aws_rm() {
 
   if aws_rest POST "2013-04-01$_domain_id/rrset/" "" "$_aws_tmpl_xml" && _contains "$response" "ChangeResourceRecordSetsResponse"; then
     _info "TXT record deleted successfully."
+    if [ -n "$slowrateslepp" ]; then
+      _info "Slow rate activated: sleeping for $slowrateslepp seconds"
+      sleep $slowrateslepp
+    fi
     return 0
   fi