Restructure build profiles

Restructure build profiles

The project requires at least JDK version 8. The specification to disable the liniting process in the JavaDoc process as of JDK version 8 is thus doubly specified and fulfilled by default; an explicit specification is no longer required. Version 3 of the JavaDoc plugin removes the "additional param" configuration attribute. The "doclint=false" configuration attribute disables the lint operation of the plugin.

Summary:
- Remove the profile "disable-doclint"
- Bump version of JavaDoc plugin to the latest > 3
- Remove the JavaDoc plugin's declaration from the build plugins used for default builds (building without a profile)
- Bump version of source plugin to latest > 3

- Remove unnecessary profile "doc" from the jclouds pom artifact