consider a valid ipv4 address as a validish ipv4 /32 cidr (#10174)

* consider a valid ipv4 address as a validish ipv4 /32 cidr

* refactor cidr evaluation for internal nets

* Apply suggestions from code review

* Update services/secondary-storage/controller/src/main/java/org/apache/cloudstack/secondarystorage/SecondaryStorageManagerImpl.java

* Update services/secondary-storage/controller/src/main/java/org/apache/cloudstack/secondarystorage/SecondaryStorageManagerImpl.java

Author: DaanHoogland

services/secondary-storage/controller/src/main/java/org/apache/cloudstack/secondarystorage/SecondaryStorageManagerImpl.java

@@ -402,10 +402,13 @@ private List<String> getAllowedInternalSiteCidrs() {
         }
         String[] cidrs = _allowedInternalSites.split(",");
         for (String cidr : cidrs) {
-            if (NetUtils.isValidIp4Cidr(cidr) || NetUtils.isValidIp4(cidr) || !cidr.startsWith("0.0.0.0")) {
-                if (NetUtils.getCleanIp4Cidr(cidr).equals(cidr)) {
+            if (NetUtils.isValidIp4Cidr(cidr) && !cidr.startsWith("0.0.0.0")) {
+                if (! NetUtils.getCleanIp4Cidr(cidr).equals(cidr)) {
                     s_logger.warn(String.format("Invalid CIDR %s in %s", cidr, SecStorageAllowedInternalDownloadSites.key()));
                 }
+                allowedCidrs.add(NetUtils.getCleanIp4Cidr(cidr));
+            } else if (NetUtils.isValidIp4(cidr) && !cidr.startsWith("0.0.0.0")) {
+                s_logger.warn(String.format("Ip address is not a valid CIDR; %s consider using %s/32", cidr, cidr));
                 allowedCidrs.add(cidr);
             }
         }