Added initscripts to dockerfile

Author: jsaliba

tests/Dockerfile.centos_7-builded

@@ -6,6 +6,10 @@ RUN yum install iproute -y
 # This step is needed since standard CentOS docker image does not come with EPEL installed by default
 RUN yum install epel-release -y
 
+# This step is needed since standard CentOS docker image does not come with init-functions installed by default.
+# This package seems to be required for Mongo 3.2 and downwards
+RUN yum install initscripts -y
+
 # we can has SSH
 EXPOSE 22