Merge istio/installer and istio/operator into istio/istio

[howardjohn]

This PR executes the merge of these 3 repos as described in GO Monorepo.

The idea here is to move all of installer under manifests/ and all of operator under operator/. Then, we do a git merge on both of these into the repo. The end result is we have the two additional folders, with full git history on all the files within. Right now these will not be functional; additional future PRs will clean up redundant files, link everything together correctly, etc.

This PR MUST be merged manually with a "Merge PR", or everything will be squashed and history will be lost.

The end result of this PR, after everything is merged via the github UI, can be found here: https://github.com/howardjohn/istio/commits/merge-master-rebase. You can see from the commits page the history of the three repos are interleaved by date, but this is just because github collapses the view. In another git client, we can see the three histories are independant:

*   b7f3e4631 "John Howard" <howardjohn@google.com> 5 minutes ago (HEAD -> merge-master-rebase, origin/merge-master-rebase)
|\  Merge pull request #19 from howardjohn/merge-operator-and-installer
| *   854e76197 "John Howard" <howardjohn@google.com> 6 minutes ago (origin/merge-operator-and-installer, merge-operator-and-installer)
| |\  Merge branch 'operator-consolidate' into merge-operator-and-installer
| * | 7943f8cfe "John Howard" <howardjohn@google.com> 7 minutes ago
|/| | Merge branch 'installer-consolidate' into merge-operator-and-installer
| | * 83455e762 "John Howard" <howardjohn@google.com> 7 minutes ago (operator-consolidate)
| | | Move everything under operator/
| * | 80fc771a5 "John Howard" <howardjohn@google.com> 7 minutes ago (installer-consolidate)
| | | Move everything under manifests/
| | * dc2f1b31f "Morven Cao" <llcao@cn.ibm.com> 5 hours ago (operator/master)
| | | add serviceAnnotation to KubernetesResourcesSpec. (#740)
| | * ad0f33310 "Morven Cao" <llcao@cn.ibm.com> 5 hours ago
| | | remove dynamic rest mapper from openshift. (#744)
| | * 4b27ee661 "Morven Cao" <llcao@cn.ibm.com> 6 hours ago
| | | fix iop status update issue. (#741)
* | | 89d5d07bd "Rama Chavali" <rama.rao@salesforce.com> 17 hours ago (origin/master, origin/HEAD, master)
| | | eds: remove inefficient get service calls while updating service shards (#20020)
* | | 176eb7af8 "Jason Young" <jasonyoung@google.com> 2 days ago
| | | Make galley use the new webhook controller and server packages (2 of 3) (#19984)
* | | e4cddc7a2 "Diem Vu" <25132401+diemtvu@users.noreply.github.com> 2 days ago
| | | Add e2e tests to verify JWT and JWT payload are output/prune as set correctly (#20050)
* | | e3aab7c01 "Shawn Rebello" <shawn.nigel@gmail.com> 2 days ago
| | | Added test for Traffic Shifting task (#19606)
* | | ae817fccf "Yuchen Dai" <silentdai@gmail.com> 2 days ago
| | | add a iptables failure detector, default off (#19534)
* | | 9dd53b96a "Zhranklin" <chigou79@outlook.com> 2 days ago
| | | Fix a group of mixer attributes generated from k8s when pod name contains dot (#20026)
* | | b3d83c6fa "Stefan Siegl" <stesie@brokenpipe.de> 2 days ago
| | | Fix segfaults: unaligned atomics on 32bit architectures (#19595)
* | | 6410b0dec "Nathan Mittler" <nmittler@gmail.com> 2 days ago
| | | Set Metrics in kube controller (#20083)

The commands used to generate this pr:

git clone https://github.com/howardjohn/istio
cd istio

git remote add installer https://github.com/howardjohn/istio-installer
git fetch installer
git checkout installer/master
git checkout -b installer-consolidate
mkdir manifests
mv * manifests
mv .gitattributes .gitignore .drone.yml .concourse manifests
git add -A
git commit -m "Move everything under manifests/"

git remote add operator https://github.com/howardjohn/operator
git fetch operator
git checkout operator/master
git checkout -b operator-consolidate
mkdir operator
mv * operator
mv .gitattributes .gitignore .codecov.yml operator
git add -A
git commit -m "Move everything under operator/"

git checkout master
git checkout -b merge-operator-and-installer
git merge --allow-unrelated-histories installer-consolidate
git merge --allow-unrelated-histories operator-consolidate

Again, this cannot be auto merged! I will use admin override to merge once this has sufficient approval - I would like at least 3 approvals to sanity check what I have done here. To avoid mistakes, I have marked this as a draft until that time

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[sdake]

LGTM

[linsun]

Thank you @howardjohn! look forward to this

[googlebot]

A Googler has manually verified that the CLAs look good.

(Googler, please make sure the reason for overriding the CLA status is clearly documented in these comments.)

ℹ️ Googlers: Go here for more info.