Implemented advice given on code review of pull request

* Multiple Files : Fixed indentation
* libraries/utils.rb : Followed your advice regarding accessing node
* attributes from library context - although the previous method seemed
* to work it may just have been working by "coincidence"
* attributes/default.rb : Added automatic deduction of major version as
* you suggested
* recipes/default.rb : Moved ld.so.conf.d template to sqlplus recipe as
* seems more relevant there
* recipes/sqlplus.rb : Added ldconfig execution notification