Explicitly expand array values

Fixes the following shellcheck errors:

    SC2145 (error): Argument mixes string and array. Use * or separate argument.
    SC2199 (error): Arrays implicitly concatenate in [[ ]]. Use a loop (or explicit * instead of @).

https://www.shellcheck.net/wiki/SC2145
https://www.shellcheck.net/wiki/SC2199

Also fixes a typo in SUPPORTED_INTERFACE_SWITCHER_MODES.

hack/run-e2e-test-kind.sh

@@ -6,7 +6,7 @@ export SRIOV_NETWORK_OPERATOR_IMAGE="${SRIOV_NETWORK_OPERATOR_IMAGE:-sriov-netwo
 export SRIOV_NETWORK_CONFIG_DAEMON_IMAGE="${SRIOV_NETWORK_CONFIG_DAEMON_IMAGE:-origin-sriov-network-config-daemon:e2e-test}"
 export KUBECONFIG="${KUBECONFIG:-${HOME}/.kube/config}"
 INTERFACES_SWITCHER="${INTERFACES_SWITCHER:-"test-suite"}"
-SUPPORTED_INTERFACE_SWTICHER_MODES=("test-suite", "system-service")
+SUPPORTED_INTERFACE_SWITCHER_MODES=("test-suite", "system-service")
 RETRY_MAX=10
 INTERVAL=10
 TIMEOUT=300
@@ -16,9 +16,9 @@ while test $# -gt 0; do
     case "$1" in
     --device-netns-switcher)
         INTERFACES_SWITCHER="$2"
-        if [[ ! "${SUPPORTED_INTERFACE_SWTICHER_MODES[@]}" =~ "${INTERFACES_SWITCHER}" ]]; then
+        if [[ ! "${SUPPORTED_INTERFACE_SWITCHER_MODES[*]}" =~ "${INTERFACES_SWITCHER}" ]]; then
             echo "Error: unsupported interface switching mode: ${INTERFACES_SWITCHER}!"
-            echo "Supported modes are: ${SUPPORTED_INTERFACE_SWTICHER_MODES[@]}"
+            echo "Supported modes are: ${SUPPORTED_INTERFACE_SWITCHER_MODES[*]}"
             exit 1
         fi
         shift

hack/vf-netns-switcher.sh

@@ -348,7 +348,7 @@ variables_check(){
 check_empty_var(){
     local var_name="$1"
 
-    if [[ -z "${!var_name[@]}" ]];then
+    if [[ -z "${!var_name[*]}" ]];then
         echo "Error: $var_name is empty..."
         return 1
     fi
@@ -403,7 +403,7 @@ for netns in "${netnses[@]}";do
 done
 
 if [[ "${#pcis[@]}" == "0" ]];then
-    echo "Error: could not get pci addresses of interfaces ${pfs[@]}!!"
+    echo "Error: could not get pci addresses of interfaces ${pfs[*]}!!"
     exit 1
 fi