HDDS-14820. test-hadoop.sh fails locally due to bad substitution

[adoroszlai]

What changes were proposed in this pull request?

Fix bad substitution in hadoop-test.sh. Steps to reproduce:

$ cd hadoop-ozone/dist/target/ozone-2.2.0-SNAPSHOT/compose/ozone
$ ./test-hadoop.sh
hadoop-ozone/dist/target/ozone-2.2.0-SNAPSHOT/compose/ozone/../common/hadoop-test.sh: line 24: ${docker.hadoop.image}: bad substitution
hadoop-ozone/dist/target/ozone-2.2.0-SNAPSHOT/compose/ozone/../common/hadoop-test.sh: line 30: HADOOP_IMAGE: unbound variable

It works in CI because HADOOP_IMAGE is defined elsewhere.

https://issues.apache.org/jira/browse/HDDS-14820

How was this patch tested?

Verified that docker.hadoop.image is substituted at build time:

diff -uw hadoop-ozone/dist/src/main/compose/common/hadoop-test.sh hadoop-ozone/dist/target/ozone-2.2.0-SNAPSHOT/compose/common/hadoop-test.sh
--- hadoop-ozone/dist/src/main/compose/common/hadoop-test.sh	2026-03-11 08:45:18.473255547 +0100
+++ hadoop-ozone/dist/target/ozone-2.2.0-SNAPSHOT/compose/common/hadoop-test.sh	2026-03-11 08:46:24.200083915 +0100
@@ -21,20 +21,20 @@
 fi
 export COMPOSE_FILE="${COMPOSE_FILE:-docker-compose.yaml}":../common/${extra_compose_file}
 
-DEFAULT_HADOOP_IMAGE="${docker.hadoop.image}"
+DEFAULT_HADOOP_IMAGE="ghcr.io/apache/hadoop"
 
 : ${HADOOP_IMAGE:="${DEFAULT_HADOOP_IMAGE}"}
 : ${HADOOP_TEST_IMAGES:=""}
 
 if [[ -z "${HADOOP_TEST_IMAGES}" ]]; then
   # hadoop2 image is only available from Docker Hub
-  HADOOP_TEST_IMAGES="${HADOOP_TEST_IMAGES} apache/hadoop:${hadoop2.version}"
+  HADOOP_TEST_IMAGES="${HADOOP_TEST_IMAGES} apache/hadoop:2.10.2"
   HADOOP_TEST_IMAGES="${HADOOP_TEST_IMAGES} ${HADOOP_IMAGE}:3.3.6"
-  HADOOP_TEST_IMAGES="${HADOOP_TEST_IMAGES} ${HADOOP_IMAGE}:${hadoop.version}${docker.hadoop.image.flavor}"
+  HADOOP_TEST_IMAGES="${HADOOP_TEST_IMAGES} ${HADOOP_IMAGE}:3.4.3"
 fi
 
 export HADOOP_MAJOR_VERSION=3
-export HADOOP_TEST_IMAGE="${HADOOP_IMAGE}:${hadoop.version}"
+export HADOOP_TEST_IMAGE="${HADOOP_IMAGE}:3.4.3"
 export OZONE_REPLICATION_FACTOR=3
 
 # shellcheck source=/dev/null