A re-run copies the operator's [[auth_source]] tables from the existing
felis toml into the new one. The awk program that finds them matched
only the literal header [[auth_source]], so a table written as
[[ auth_source ]], [["auth_source"]] or [['auth_source']], all valid
TOML, was taken for some other section and dropped from the config.
Each section header now decides afresh whether it opens an auth_source
table, through one regex that allows inner whitespace and a single- or
double-quoted key. The single quote is spelled \047, which gawk and
mawk both honour inside a bracket expression. The harness carries each
spelling and checks that the table still stops at the next section.
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