HBase: use `config-utils` instead of `sed` in entrypoint.sh script

[adwk67]

entrypoint.sh currently contains the folloiwng:

# Kerberos
if [ -f /stackable/kerberos/krb5.conf ]; then
  KERBEROS_REALM=$(grep -oP 'default_realm = \K.*' /stackable/kerberos/krb5.conf)
  export KERBEROS_REALM
  sed -i -e s/\$\{env\.KERBEROS_REALM\}/"${KERBEROS_REALM}"/g /stackable/conf/core-site.xml
  sed -i -e s/\$\{env\.KERBEROS_REALM\}/"${KERBEROS_REALM}"/g /stackable/conf/hbase-site.xml
  sed -i -e s/\$\{env\.KERBEROS_REALM\}/"${KERBEROS_REALM}"/g /stackable/conf/hdfs-site.xml
fi

# Service endpoints
HBASE_SERVICE_PORT=$(cat /stackable/listener/default-address/ports/"${HBASE_PORT_NAME}")
HBASE_INFO_PORT=$(cat /stackable/listener/default-address/ports/"${HBASE_UI_PORT_NAME}")
HBASE_LISTENER_ENDPOINT="$HBASE_SERVICE_HOST:$HBASE_INFO_PORT"

sed -i -e s/\$\{HBASE_SERVICE_HOST\}/"${HBASE_SERVICE_HOST}"/g /stackable/conf/hbase-site.xml
sed -i -e s/\$\{HBASE_SERVICE_PORT\}/"${HBASE_SERVICE_PORT}"/g /stackable/conf/hbase-site.xml
sed -i -e s/\$\{HBASE_LISTENER_ENDPOINT\}/"${HBASE_LISTENER_ENDPOINT}"/g /stackable/conf/hbase-site.xml
sed -i -e s/\$\{HBASE_INFO_PORT\}/"${HBASE_INFO_PORT}"/g /stackable/conf/hbase-site.xml

These calls should be replaced with e.g.

config-utils template /stackable/conf/core-site.xml
config-utils template /stackable/conf/hbase-site.xml
...

Corresponding changes should be made to the operator and it should be checked that ${env:KERBEROS_REALM} (colon) can be used instead of ${env:KERBEROS_REALM} (dot) - which is specfic to the haddop config loader.