Merge branch 'jk/parse-config-key-cleanup'

The "parse_config_key()" API function has been cleaned up.

* jk/parse-config-key-cleanup:
parse_hide_refs_config: tell parse_config_key we don't want a subsection
parse_config_key: allow matching single-level config
parse_config_key: use skip_prefix instead of starts_with

diff --cc cache.h
Simple merge

diff --cc config.c
Simple merge

diff --cc refs.c
Simple merge