[repo] Method to get all repository metadata locations

Needed so that command "dnf reposync --urls --download-metadata" was
able to print out also URLs of the repository metadata.

Closes: #770
Approved by: <try>

libdnf/repo/Repo-private.hpp

@@ -148,6 +148,7 @@ class Repo::Impl {
     std::string revision;
     std::vector<std::string> content_tags;
     std::vector<std::pair<std::string, std::string>> distro_tags;
+    std::vector<std::pair<std::string, std::string>> metadata_locations;
     unsigned char checksum[CHKSUM_BYTES];
     bool useIncludes{false};
     bool loadMetadataOther;

libdnf/repo/Repo.cpp

@@ -1007,6 +1007,15 @@ bool Repo::Impl::loadCache(bool throwExcept)
                 distro_tags.emplace_back(distroTag->cpeid, distroTag->tag);
         }
     }
+
+    metadata_locations.clear();
+    for (auto elem = yum_repomd->records; elem; elem = g_slist_next(elem)) {
+        if (elem->data) {
+            auto rec = static_cast<LrYumRepoMdRecord *>(elem->data);
+            metadata_locations.emplace_back(rec->type, rec->location_href);
+        }
+    }
+
     if (auto cRevision = yum_repomd->revision) {
         revision = cRevision;
     }
@@ -1499,6 +1508,11 @@ const std::vector<std::pair<std::string, std::string>> & Repo::getDistroTags()
     return pImpl->distro_tags;
 }
 
+const std::vector<std::pair<std::string, std::string>> Repo::getMetadataLocations() const
+{
+    return pImpl->metadata_locations;
+}
+
 const std::string & Repo::getRevision() const
 {
     return pImpl->revision;

libdnf/repo/Repo.hpp

@@ -245,6 +245,7 @@ struct Repo {
 
     const std::vector<std::string> & getContentTags();
     const std::vector<std::pair<std::string, std::string>> & getDistroTags();
+    const std::vector<std::pair<std::string, std::string>> getMetadataLocations() const;
 
     std::string getCachedir() const;
     void setRepoFilePath(const std::string & path);