`rpl_start`/`stop_server.inc` fixes

[ParadoxV5]

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• ~~The Jira issue number for this PR is: MDEV-______~~

Description

• rpl_stop_server.inc: re. “can’t use begin/end_include_file”, (re)define $_include_file_depth= 0 in case this is the first --source in a rpl_init.inc-less setup (e.g., multi_source.*)
• rpl_start_server.inc: move the end_include_file.inc call out of if (!$rpl_server_error) to always close the begin_include_file.inc
• rpl_reconnect.inc (called by rpl_start_server.inc): skip reconnecting ‘master/slave’ aliases of server_*to lift its practical requirement ofmaster-slave.inc(It failed with “no connection named master/slave” for even arpl_init.incsetup, let alonerpl_init`-less.)

Release Notes

Do our users even use our include/*.incs?

How can this PR be tested?

• [ ] Do we need a test for a test?

PR quality check

• [ ] This is a new feature or a refactoring, and the PR is based against the main branch.
• [x] This is a bug fix, and the PR is based against the earliest maintained branch in which the bug can be reproduced.
• [x] I checked the CODING_STANDARDS.md file and my PR conforms to this where appropriate.
• [x] For any trivial modifications to the PR, I am ok with the reviewer making the changes themselves.