`brew doctor` shelled to `brew missing` and parsed the results.
When VERBOSE was true, this caused an error as extra, unexpected
output is generated.
Make missing an internal command, and give it a programmatic interface.
Rationale: some users insist on replacing the /usr/bin/ruby symlink
to point to another ruby on their system, which may break homebrew.
Use the full Framework path instead, which is less likely to be tampered with.
This also reorganizes the brew --config checks to reflect the different path.
FixesHomebrew/homebrew#12009.
ClosesHomebrew/homebrew#12333.
Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
If a formula implements startup_plist it has out-of-the-box support by
brew services. If not it's possible to specify the path to a plist file:
`brew services couchdb-lucence /usr/local/Cellar/..../couchdb-lucene.plist`.
FixesHomebrew/homebrew#3422.
Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
