Add possibility to overwrite all variables by env var

Some variables like LOG_FILE is hardcoded and can not be overwrite.
This commit causes each of the variables to be overwritten.

pkg/bundle/setup/clustersetup.sh

@@ -1,20 +1,20 @@
 #!/bin/bash
 #CONST
-export KUBECONFIG="/opt/kubeconfig"
-LOG_PATH="/tmp"
-LOG_FILE="$LOG_PATH/_RANDOM_SUFFIX_.log"
-DNSMASQ_CONF="/etc/dnsmasq.d/crc-dnsmasq.conf"
-CLUSTER_HEALTH_SLEEP=8
-CLUSTER_HEALTH_RETRIES=500
-STEPS_SLEEP_TIME=10
+KUBECONFIG="/opt/kubeconfig"
+LOG_PATH="${LOG_PATH:-"/tmp"}"
+LOG_FILE="${LOG_FILE:-"$LOG_PATH/_RANDOM_SUFFIX_.log"}"
+DNSMASQ_CONF="${DNSMASQ_CONF:-"/etc/dnsmasq.d/crc-dnsmasq.conf"}"
+CLUSTER_HEALTH_SLEEP="${CLUSTER_HEALTH_SLEEP:-8}"
+CLUSTER_HEALTH_RETRIES="${CLUSTER_HEALTH_RETRIES:-500}"
+STEPS_SLEEP_TIME="${STEPS_SLEEP_TIME:-10}"
 #REPLACED VARS
 IIP="${IIP:-"_IIP_"}"
 EIP="${EIP:-"_EIP_"}"
 PULL_SECRET="${PULL_SECRET:-"_PULL_SECRET_"}"
 PASS_DEVELOPER="${PASS_DEVELOPER:-"_PASS_DEVELOPER_"}"
 PASS_KUBEADMIN="${PASS_KUBEADMIN:-"_PASS_KUBEADMIN_"}"
 PASS_REDHAT="${PASS_REDHAT:-"_PASS_REDHAT_"}"
-MAXIMUM_LOGIN_RETRY=500
+MAXIMUM_LOGIN_RETRY="${MAXIMUM_LOGIN_RETRY:-500}"
 
 pr_info() {
  echo "[INF] $1" | tee -a $LOG_FILE > /dev/null