fab-1873 fix images/peer/Dockerfile.in to

https://jira.hyperledger.org/browse/FAB-1873

Set the ENV in images/peer/Dockerfile.in as well

Change-Id: I6a8d57748eb9c59db81599894aa608d8ebd25d8d
Signed-off-by: Srinivasan Muralidharan <muralisr@us.ibm.com>

Author: Srinivasan Muralidharan

images/peer/Dockerfile.in

@@ -1,5 +1,6 @@
 FROM hyperledger/fabric-baseos:_BASE_TAG_
 ENV PEER_CFG_PATH /etc/hyperledger/fabric
+ENV CORE_PEER_MSPCONFIGPATH $PEER_CFG_PATH/msp/sampleconfig
 RUN mkdir -p /var/hyperledger/production $PEER_CFG_PATH
 COPY payload/peer /usr/local/bin
 COPY payload/core.yaml $PEER_CFG_PATH