Add missing repository for sdnr to ccsdk-sli distribution for ubuntu and alpine.
Add variable and entry in dockerfile
for depency.
<groupId>org.onap.ccsdk.features.sdnr.wt</groupId>
<artifactId>sdnr-wt-feature-aggregator</artifactId>
<version>${ccsdk.features.version}</version>

ENV CCSDK_FEATURES_SDNR_WT_REPO mvn:org.onap.ccsdk.features.sdnr.wt/sdnr-wt-feature-aggregator/${ccsdk.features.version}/xml/features

REMARK: Can not be part of ccsdk-features-all because of dependecy to netconf. This is handled in sdnc-oam.