wordmove should ignore or warn about trailing slashes in 'vhost'

[alessandro-fazzi]

Discussed in #644

^{Originally posted by castilma February 15, 2022}
$Title, to prevent others from the error in #641.

As reasonated in #641 (comment):

it would suffice to update the pattern used by doctor to validate movefile.yml. Here lib/wordmove/assets/wordmove_schema_remote.yml and here lib/wordmove/assets/wordmove_schema_local.yml.

This way a user would be warned about the trailing slash in the vhost key.