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: Ief04f3efcd54c896ec71ddef053474dff882c488
Issue-ID: CIMAN-132
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
diff --git a/installation/pom.xml b/installation/pom.xml
index b6a5fb0..d83590a 100644
--- a/installation/pom.xml
+++ b/installation/pom.xml
@@ -42,7 +42,7 @@
 
 	<properties>
 		<application.name>installation</application.name>
-		<maven.build.timestamp.format>yyMMdd-HHmmss</maven.build.timestamp.format>
+		<maven.build.timestamp.format>yyyyMMdd'T'HHmmss'Z'</maven.build.timestamp.format>
 		<build.number>${maven.build.timestamp}</build.number>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>