Update srv_ctl.rb
Update srv_ctl.rb

Added host option processing. To restrict berlshelf-api listening only on one address.
pantheon-systems/berkshelf-api,damacus/berkshelf-api,pantheon-systems/berkshelf-api,gueux/berkshelf-api,gueux/berkshelf-api,damacus/berkshelf-api,pingworks/berkshelf-api-binrepo-store,pingworks/berkshelf-api-binrepo-store,gueux/berkshelf-api,pingworks/berkshelf-api-binrepo-store,damacus/berkshelf-api,pantheon-systems/berkshelf-api