Unblock the Aluminium Jenkins Verified Build Pass

Unblock the Aluminium Jenkins Verified Build Pass

Issue;
=====
Post Openflowplugin patch[0] merge, netvirt build is starting to get
failed with below key related issues.

18: 37:14 [ERROR] COMPILATION ERROR :
18: 37:14 [INFO]
18:37:14 [ERROR]
/w/workspace/netvirt-maven-javadoc-publish-aluminium-openjdk11/aclservice/impl/src/main/java/org/
opendaylight/netvirt/aclservice/stats/AclLiveStatisticsHelper.java:[29,108]
cannot find symbol
18:37:14   symbol:   class FlowAndStatisticsMapListKey
18:37:14   location: package
org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819
.flow.and.statistics.map.list
18:37:14 [INFO] 1 error

Jenkins build reference :
https://jenkins.opendaylight.org/releng/job/netvirt-maven-javadoc-verify-aluminium-openjdk11/338/console

[0] https://git.opendaylight.org/gerrit/c/openflowplugin/+/90390

Solution:
========
FlowAndStatisticsMapListKey is being used in only ACL service so changed
this method to List instead of Map

Signed-off-by: Karthikeyan Krishnan <karthikeyangceb007@gmail.com>
Change-Id: I0a4dc6ad9e738b292b394790f6ff9944442c49e1