Only collect "*.conf" for nginx (#3380)
Only collect "*.conf" for nginx (#3380)

* Some unused files have syntax error, as a result, it won't be hit
  even there is a hit for the used files.

Signed-off-by: Huanhuan Li <698138010c846de0dab86d9f6cf3a5f8e2b70af1@redhat.com>
RedHatInsights/insights-core,RedHatInsights/insights-core