Allow several env variables to be set in rabbitmq-env-conf.bat

Fixes #9258

This patch allows the following variables to be set by `rabbitmq-env-conf.bat`:

* `LOG_BASE`
* `MNESIA_BASE`
* `CONFIG_FILE`

deps/rabbit/scripts/rabbitmq-env.bat

@@ -129,6 +129,24 @@ if "!RABBITMQ_BOOT_MODULE!"=="" (
     )
 )
 
+if "!RABBITMQ_CONFIG_FILE!"=="" (
+    if not "!CONFIG_FILE!"=="" (
+        set RABBITMQ_CONFIG_FILE=!CONFIG_FILE!
+    )
+)
+
+if "!RABBITMQ_LOG_BASE!"=="" (
+    if not "!LOG_BASE!"=="" (
+        set RABBITMQ_LOG_BASE=!LOG_BASE!
+    )
+)
+
+if "!RABBITMQ_MNESIA_BASE!"=="" (
+    if not "!MNESIA_BASE!"=="" (
+        set RABBITMQ_MNESIA_BASE=!MNESIA_BASE!
+    )
+)
+
 REM [ "x" = "x$RABBITMQ_CTL_ERL_ARGS" ] && RABBITMQ_CTL_ERL_ARGS=${CTL_ERL_ARGS}
 if "!RABBITMQ_CTL_ERL_ARGS!"=="" (
     if not "!CTL_ERL_ARGS!"=="" (
@@ -164,13 +182,6 @@ if "!RABBITMQ_SERVICENAME!"=="" (
 )
 
 REM Environment cleanup
-set BOOT_MODULE=
-set CONFIG_FILE=
-set FEATURE_FLAGS_FILE=
-set ENABLED_PLUGINS_FILE=
-set LOG_BASE=
-set MNESIA_BASE=
-set PLUGINS_DIR=
 set SCRIPT_DIR=
 set SCRIPT_NAME=
 set TDP0=

deps/rabbit/scripts/rabbitmq-service.bat

@@ -226,6 +226,9 @@ rem user-specific directory.
 -env ERL_MAX_ETS_TABLES="!ERL_MAX_ETS_TABLES!" ^
 -env ERL_MAX_PORTS="!ERL_MAX_PORTS!" ^
 -env RABBITMQ_BASE="!RABBITMQ_BASE!" ^
+-env RABBITMQ_CONFIG_FILE="!RABBITMQ_CONFIG_FILE!" ^
+-env RABBITMQ_LOG_BASE="!RABBITMQ_LOG_BASE!" ^
+-env RABBITMQ_MNESIA_BASE="!RABBITMQ_MNESIA_BASE!" ^
 -env RABBITMQ_NODENAME="!RABBITMQ_NODENAME!" ^
 -workdir "!RABBITMQ_BASE!" ^
 -stopaction "rabbit:stop_and_halt()." ^