test_e2e.sh: use local for all variables defined inside functions

[rul]

Use local for all variables defined inside functions; also convert them all to common name style (lowercase for locals)

Originally posted by @thockin in #902 (comment)

[thisisharrsh]

Hi @rul, thank you for the contribution, as I can observe the PR is merged now, so you can now close this issue.

[thockin]

AFAICT, this is not done:

function assert_file_lines_eq() {
    N=$(wc -l < "$1")                                  

function docker_run() {
    RM="--rm"

function init_repo() {
    arg="${1}"                                                                                                                                                                   

function GIT_SYNC() {
    #./bin/linux_amd64/git-sync "$@"
    RM="--rm"                           

    # make a worktree to collide with git-sync
    SHA=$(git -C "$REPO" rev-list -n1 HEAD)                                     

etc

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[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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• Mark this issue as fresh with /remove-lifecycle stale
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/lifecycle stale