Show OVAL details for extend_definition
Show OVAL details for extend_definition

If an OVAL definition was extended using 'extend_definition', there were
no details shown in the HTML report for the refereced definition(s).
This commit adds OVAL details for the extended definition to HTML report.
Fixes #916, #954.

redhatrises/openscap,redhatrises/openscap,redhatrises/openscap,redhatrises/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,redhatrises/openscap,OpenSCAP/openscap,redhatrises/openscap,OpenSCAP/openscap,OpenSCAP/openscap