TEIIDDES-1591: Override the secure storage default password provider

* Overrides the default displayed dialog with something altogether more
  informative.

* Adds in an help context so that help icon on the dialog points to
  the Secure Storage documentation that comes as part of eclipse.
TEIIDDES-1591: Make some fixes to the fragment

* Rename the fragment to jboss.tools and the package accordingly

* Simplifies the dialog's displayed discription

* Fixes missing NoDigestPassword message