Revert "Fix #11003 TypeError: can only concatenate list (not "ImmutableLazyProxy(list)") to list"

This reverts commit 50fe12a5f515e3bb37ea0df7222b5c8c61229b63.
`ImmutableList`'s should also support `__radd__`. Fixes #11003.
Merge pull request #11072 from viraptor/startup_errors

Report errors when preparation fails
Merge pull request #11071 from makinacorpus/lxc

Lxc
Merge pull request #11074 from makinacorpus/archive

salt.states.archive: multiple improvments
Merge pull request #11079 from jarus/virtualenv-exists-already-action

Add pip_exists_action argument to virtualenv state
Typo fix.
Merge pull request #11089 from cachedout/typo_doc_fix

Typo fix.
Spelling correction: exttermal > external
Merge pull request #11086 from krak3n/fix-master._clear_old_jobs-ext_pillar-root

Fix master._clear_old_jobs for ext_pillars with root parameter
Clarify when the new "root" param for git_pillar will be added
remove stale comments
Merge pull request #11092 from mgwilliams/lxc

lxc: saltify -> bootstrap; lxc & seed: doc improvements
Started some integration tests for mac_user module
refactor some method names in stack to be more consistent
Merge pull request #11091 from terminalmage/docs

Clarify when the new "root" param for git_pillar will be added
Refactor name of server for each stack to .server since udp or uxd is redundant as the type is
determined by the stack
Rnamed UxdTxes to txes UxdRxes to rxes since type is given by the stack type name is redundant
Renamed udpTxes to txes UdpRxes to rexes since type is given the the stack type, name is redunant
Add test case which triggers #11003.
renamed udpTxes udpRxes as redunant to rxes and txes
samek for uxdTxes uxdRxes