tst_kvercmp: Add rhel7,8 support

Signed-off-by: Yang Xu <[email protected]>
Reviewed-by: Cyril Hrubis <[email protected]>

Author: xuyang0410

lib/tst_kvercmp.c

@@ -146,6 +146,12 @@ const char *tst_kvcmp_distname(const char *kver)
 	if (strstr(kver, ".el6"))
 		return "RHEL6";
 
+	if (strstr(kver, ".el7"))
+		return "RHEL7";
+
+	if (strstr(kver, ".el8"))
+		return "RHEL8";
+
 	if (access(OSRELEASE_PATH, F_OK) != -1) {
 		SAFE_FILE_LINES_SCANF(NULL, OSRELEASE_PATH, "ID=%s", distname);