oscap_source_get_scap_type shall recognize TestResult.
oscap_source_get_scap_type shall recognize TestResult.

This is needed since oscap_source is used to validate input
files for ARF compose.

Addressing:
OpenSCAP Error: Unknown document type: './rds_testresult/results-xccdf.xml' [oscap_source.c:133]
Unknown document type: './rds_testresult/results-xccdf.xml' [oscap_source.c:133]

openprivacy/openscap,ybznek/openscap,Hexadorsimal/openscap,Hexadorsimal/openscap,postfix/openscap,redhatrises/openscap,Hexadorsimal/openscap,redhatrises/openscap,isimluk/openscap,postfix/openscap,jan-cerny/openscap,OpenSCAP/openscap,ybznek/openscap,postfix/openscap,postfix/openscap,openprivacy/openscap,OpenSCAP/openscap,openprivacy/openscap,OpenSCAP/openscap,redhatrises/openscap,OpenSCAP/openscap,ybznek/openscap,redhatrises/openscap,jan-cerny/openscap,OpenSCAP/openscap,Hexadorsimal/openscap,isimluk/openscap,mpreisler/openscap,mpreisler/openscap,ybznek/openscap,ybznek/openscap,jan-cerny/openscap,postfix/openscap,openprivacy/openscap,openprivacy/openscap,postfix/openscap,isimluk/openscap,mpreisler/openscap,jan-cerny/openscap,isimluk/openscap,Hexadorsimal/openscap,jan-cerny/openscap,redhatrises/openscap,OpenSCAP/openscap,isimluk/openscap,redhatrises/openscap,jan-cerny/openscap,Hexadorsimal/openscap,isimluk/openscap,openprivacy/openscap,mpreisler/openscap,ybznek/openscap,mpreisler/openscap,mpreisler/openscap