Update docker tag convention

Update docker tagging convention to use:
v0.17.0-SNAPSHOT-YYYYMMDDTHHMMSSZ (for dev images)
v0.17.0-STAGING-YYYYMMDDTHHMMSSZ (for staging images)

Change-Id: I1261e0d80bfa7fcf66781fbc3f59056ddac5aa99
Issue-ID: CIMAN-132
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
diff --git a/pom.xml b/pom.xml
index 9428f38..116ddd9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -13,7 +13,7 @@
         <sitePath>/content/sites/site/org/onap/sdc/${project.artifactId}/${project.version}</sitePath>
         <!--maven-->
         <timestamp>${maven.build.timestamp}</timestamp>
-        <maven.build.timestamp.format>yyyy.MM.dd.HH.mm</maven.build.timestamp.format>
+        <maven.build.timestamp.format>yyyyMMdd'T'HHmmss'Z'</maven.build.timestamp.format>
         <!--docker-->
         <docker.tag>${project.version}-${timestamp}</docker.tag>
         <docker.latest.tag>${project.version}-latest</docker.latest.tag>