upgrade: Alpine 3.9 for vulnerability patches

Alpine 3.8 has a vulnerable version of Busybox.
We need to update to version >= 1.30.1 to receive
the relevant security patches.

Author: ryanwohara

chronograf/1.5/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN echo 'hosts: files dns' >> /etc/nsswitch.conf
 RUN apk add --no-cache ca-certificates && \

chronograf/1.6/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN echo 'hosts: files dns' >> /etc/nsswitch.conf
 RUN apk add --no-cache ca-certificates && \

chronograf/1.7/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN echo 'hosts: files dns' >> /etc/nsswitch.conf
 RUN apk add --no-cache ca-certificates && \

influxdb/1.5/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN echo 'hosts: files dns' >> /etc/nsswitch.conf
 RUN apk add --no-cache tzdata bash ca-certificates && \

influxdb/1.6/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN echo 'hosts: files dns' >> /etc/nsswitch.conf
 RUN apk add --no-cache tzdata bash ca-certificates && \

influxdb/1.7/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN echo 'hosts: files dns' >> /etc/nsswitch.conf
 RUN apk add --no-cache tzdata bash ca-certificates && \

influxdb/nightly/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN apk add --no-cache bash
 

kapacitor/1.4/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN echo 'hosts: files dns' >> /etc/nsswitch.conf
 RUN apk add --no-cache ca-certificates && \

kapacitor/1.5/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN echo 'hosts: files dns' >> /etc/nsswitch.conf
 RUN apk add --no-cache ca-certificates && \

telegraf/1.10/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN echo 'hosts: files dns' >> /etc/nsswitch.conf
 RUN apk add --no-cache iputils ca-certificates net-snmp-tools procps lm_sensors && \