Fix build failure of base images

Upgrade of Alpine linux version of the openjdk:8-jdk-alpine
base image obsoleted usage of edge repositories.
These repositories were causing build failures.
Elasticsearch newly requires an installation of linux-headers package.
This package is required to build dependencies for plugin berkshelf.

Issue-ID: SDC-2581
Signed-off-by: Denis Kasanic <denis.kasanic@tieto.com>
Change-Id: Ib71846d4d449f035cf7633c8ac786553364efef7
diff --git a/base_sdc-cqlsh/Dockerfile b/base_sdc-cqlsh/Dockerfile
index 9595764..7cc7566 100644
--- a/base_sdc-cqlsh/Dockerfile
+++ b/base_sdc-cqlsh/Dockerfile
@@ -1,7 +1,6 @@
 FROM openjdk:8-jdk-alpine
 
 RUN apk add --no-cache py-pip && \
-    echo "http://nl.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories && \
     pip install cqlsh==4.0.1 && \
     set -ex && \
     pip install cqlsh && \
diff --git a/base_sdc-elasticsearch/Dockerfile b/base_sdc-elasticsearch/Dockerfile
index 15c9746..e505991 100644
--- a/base_sdc-elasticsearch/Dockerfile
+++ b/base_sdc-elasticsearch/Dockerfile
@@ -5,6 +5,7 @@
 # Install Chef
 RUN set -ex && \
     apk add --no-cache \
+        linux-headers \
         curl \
         vim \
         bash \
diff --git a/base_sdc-jetty/Dockerfile b/base_sdc-jetty/Dockerfile
index df05d8f..3c761bf 100644
--- a/base_sdc-jetty/Dockerfile
+++ b/base_sdc-jetty/Dockerfile
@@ -4,7 +4,6 @@
 
 # Install Chef
 RUN set -ex && \
-    echo "http://nl.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories && \
     apk update && \
     apk add --no-cache \
         jq \
diff --git a/base_sdc-python/Dockerfile b/base_sdc-python/Dockerfile
index f80ffe0..353446c 100644
--- a/base_sdc-python/Dockerfile
+++ b/base_sdc-python/Dockerfile
@@ -4,8 +4,7 @@
 ENV PYCURL_SSL_LIBRARY=openssl
 
 # Install packages only needed for building
-RUN echo "http://nl.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories && \
-    apk update && \
+RUN apk update && \
     apk add binutils jq libpng && \
     apk add --no-cache \
         libcurl \
diff --git a/base_sdc-sanity/Dockerfile b/base_sdc-sanity/Dockerfile
index 77f0da9..635e2c6 100644
--- a/base_sdc-sanity/Dockerfile
+++ b/base_sdc-sanity/Dockerfile
@@ -2,7 +2,6 @@
 
 # Install Chef
 RUN set -ex && \
-    echo "http://nl.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories && \
     apk add --no-cache \
     curl \
     vim \