Append the hour and minute to the snapshot suffix for EC2

AMIs and Azure VM images.  This is particularly helpful for
testing to avoid name collisions, but also useful for cases
where a necessary rebuild is done before the date changes.

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

release/Makefile.azure

@@ -17,7 +17,7 @@ AZURE${VAR}!=	grep -E ^AZURE${VAR} ${AZURE_UPLOAD_CONF} | awk -F'	' '{print $$2}
 .endif
 
 .if ${BRANCH} == "STABLE" || ${BRANCH} == "CURRENT"
-SNAPSHOT_DATE!=		date +-%Y-%m-%d
+SNAPSHOT_DATE!=		date +-%Y-%m-%d-%H:%M
 .endif
 
 AZURE_TARGET:=		${OSRELEASE}${SNAPSHOT_DATE}.vhd

release/Makefile.ec2

@@ -6,7 +6,7 @@
 #
 
 .if ${BRANCH} == "CURRENT" || ${BRANCH} == "STABLE"
-AMINAMESUFFIX!=	date +-%Y-%m-%d
+AMINAMESUFFIX!=	date +-%Y-%m-%d-%H:%M
 .endif
 .if defined(EC2PUBLIC)
 PUBLISH=	--public