arangodb: Use opt_prefix

Cleaning up places that can use `opt_prefix` instead of
`#{HOMEBREW_PREFIX}/opt/<packagename>`
chruby: Use opt_prefix

Cleaning up places that can use `opt_prefix` instead of
`#{HOMEBREW_PREFIX}/opt/<packagename>`
couchdb-lucene: Use opt_prefix

Cleaning up places that can use `opt_prefix` instead of
`#{HOMEBREW_PREFIX}/opt/<packagename>`
elasticsearch: Use opt_prefix

Cleaning up places that can use `opt_prefix` instead of
`#{HOMEBREW_PREFIX}/opt/<packagename>`
jenkins: Use opt_prefix

Cleaning up places that can use `opt_prefix` instead of
`#{HOMEBREW_PREFIX}/opt/<packagename>`
memcached: Use opt_prefix

Cleaning up places that can use `opt_prefix` instead of
`#{HOMEBREW_PREFIX}/opt/<packagename>`
nexus: Use opt_prefix

Cleaning up places that can use `opt_prefix` instead of
`#{HOMEBREW_PREFIX}/opt/<packagename>`

This package had a hardcoded `/usr/local/` instead of a
Homebrew path in the .plist file.
passenger: Use opt_prefix

Cleaning up places that can use `opt_prefix` instead of
`#{HOMEBREW_PREFIX}/opt/<packagename>`
selenium-server-standalone: Use opt_prefix

Cleaning up places that can use `opt_prefix` instead of
`#{HOMEBREW_PREFIX}/opt/<packagename>`
sonar: Use opt_prefix

Cleaning up places that can use `opt_prefix` instead of
`#{HOMEBREW_PREFIX}/opt/<packagename>`