Use local for function variables.

Right now srcDir/destDir is used in each function and
if someone pass different option to any of that function
it will change it for other functions. We should use local
for function variables.

createdisk.sh

@@ -26,7 +26,7 @@ function get_git_tag {
 }
 
 function create_crc_libvirt_sh {
-    destDir=$1
+    local destDir=$1
 
     hostInfo=$(sudo virsh net-dumpxml ${VM_PREFIX} | grep ${VM_PREFIX}-master-0 | sed "s/^[ \t]*//")
     masterMac=$(sudo virsh dumpxml ${VM_PREFIX}-master-0 | grep "mac address" | sed "s/^[ \t]*//")
@@ -40,7 +40,7 @@ function create_crc_libvirt_sh {
 }
 
 function create_qemu_image {
-    destDir=$1
+    local destDir=$1
 
     sudo cp /var/lib/libvirt/images/${VM_PREFIX}-master-0 $destDir
     sudo cp /var/lib/libvirt/images/${VM_PREFIX}-base $destDir
@@ -58,8 +58,8 @@ function create_qemu_image {
 }
 
 function update_json_description {
-    srcDir=$1
-    destDir=$2
+    local srcDir=$1
+    local destDir=$2
 
     diskSize=$(du -b $destDir/${CRC_VM_NAME}.qcow2 | awk '{print $1}')
     diskSha256Sum=$(sha256sum $destDir/${CRC_VM_NAME}.qcow2 | awk '{print $1}')
@@ -81,8 +81,8 @@ function update_json_description {
 }
 
 function copy_additional_files {
-    srcDir=$1
-    destDir=$2
+    local srcDir=$1
+    local destDir=$2
 
     # Generate the libvirt sh file in source directory to test the disk image if required.
     # Don't include this in the destDir so it will not be part of final disk tarball.
@@ -99,8 +99,8 @@ function copy_additional_files {
 }
 
 function generate_vbox_directory {
-    srcDir=$1
-    destDir=$2
+    local srcDir=$1
+    local destDir=$2
 
     cp $srcDir/kubeadmin-password $destDir/
     cp $srcDir/kubeconfig $destDir/
@@ -122,9 +122,9 @@ function generate_vbox_directory {
 }
 
 function generate_hyperkit_directory {
-    srcDir=$1
-    destDir=$2
-    tmpDir=$3
+    local srcDir=$1
+    local destDir=$2
+    local tmpDir=$3
 
     cp $srcDir/kubeadmin-password $destDir/
     cp $srcDir/kubeconfig $destDir/
@@ -143,8 +143,8 @@ function generate_hyperkit_directory {
 }
 
 function generate_hyperv_directory {
-    srcDir=$1
-    destDir=$2
+    local srcDir=$1
+    local destDir=$2
 
     cp $srcDir/kubeadmin-password $destDir/
     cp $srcDir/kubeconfig $destDir/