Add startUpScriptVersion for pd spec

[july2993]

What problem does this PR solve?

for version >= v.5.0.5, the nslookup version is changed in the image.

if nameserver in /etc/resolv.conf contains not only coredns cluster ip, PD pod will fail to start since the startup script use nslookup and the behavior of nslookup is different from general resolver.

ref: https://serverfault.com/a/398854
coredns/coredns#3835 (comment)

https://github.com/isc-projects/bind9/blob/808d0b07b00244de735be68ce85b2652e4e0efec/bin/dig/dighost.c#L4128-L4162

  if ((msg->rcode == dns_rcode_servfail && !l->servfail_stops) ||
(check_ra && (msg->flags & DNS_MESSAGEFLAG_RA) == 0 && l->recurse))

we will hit the check_ra&&。。 condition here, and nslookup will try the next nameserver, and the next nameserver will return NXDOMAIN(since it is not the coredns)

What is changed and how does it work?

support add startUpScriptVersion as v1 to use dig to wait dns can be
resolved:
...
pd:
startUpScriptVersion: "v1"
...

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Manual test
• deploy cluster using master version
• upgrade operator as version of the PR
• check will not trigger update of PD

---

• set startUpScriptVersion as v1
• check PD start success and startup script is using the v1

---

apply some invalid value

The TidbCluster "basic" is invalid: spec.pd.startUpScriptVersion: Unsupported value: "v11": supported values: "", "v1"

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• DanielZhangQD
• csuzhangxc

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[codecov-commenter]

Codecov Report

Merging #4379 (3ffd0bf) into master (589a445) will increase coverage by 9.08%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #4379      +/-   ##
==========================================
+ Coverage   62.63%   71.72%   +9.08%     
==========================================
  Files         184      188       +4     
  Lines       19573    21960    +2387     
==========================================
+ Hits        12260    15750    +3490     
+ Misses       6167     5080    -1087     
+ Partials     1146     1130      -16     

Flag	Coverage Δ
e2e	59.60% <50.00%> (?)
unittest	62.62% <50.00%> (-0.02%)	⬇️

[DanielZhangQD]

LGTM

[DanielZhangQD]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 3ffd0bf

[ti-srebot]

cherry pick to release-1.2 in PR #4411