Always check for root disks unless MINIO_CI_CD is set (#14232)

The current code considers a pool with all root disks to be as part
of a testing environment even if there are other pools with mounted
disks. This will result to illegitimate writing in root disks.

Fix this by simplifing the logic: require MINIO_CI_CD in order to skip
root disk check.

buildscripts/unaligned-healing.sh

@@ -30,6 +30,7 @@ function start_minio_16drive() {
     export MC_HOST_minio="http://minio:minio123@127.0.0.1:${start_port}/"
     unset MINIO_KMS_AUTO_ENCRYPTION # do not auto-encrypt objects
     export _MINIO_SHARD_DISKTIME_DELTA="5s" # do not change this as its needed for tests
+    export MINIO_CI_CD=1
 
     MC_BUILD_DIR="mc-$RANDOM"
     if ! git clone --quiet https://github.com/minio/mc "$MC_BUILD_DIR"; then

buildscripts/verify-build.sh

@@ -22,6 +22,8 @@ export GO111MODULE=on
 export GOGC=25
 export ENABLE_ADMIN=1
 
+export MINIO_CI_CD=1
+
 MINIO_CONFIG_DIR="$WORK_DIR/.minio"
 MINIO=( "$PWD/minio" --config-dir "$MINIO_CONFIG_DIR" )
 

buildscripts/verify-healing.sh

@@ -17,6 +17,7 @@ function start_minio_3_node() {
     export MINIO_ROOT_USER=minio
     export MINIO_ROOT_PASSWORD=minio123
     export MINIO_ERASURE_SET_DRIVE_COUNT=6
+    export MINIO_CI_CD=1
 
     start_port=$2
     args=""