filestore: respect g_disable_hashing

If g_disable_hashing is set, behave like libnss wasn't compiled
in.

src/util-file.c

@@ -181,10 +181,15 @@ void FileForceHashParseCfg(ConfNode *conf)
                 "found. Please use 'force-hash: [md5]' instead");
 
         if (ConfValIsTrue(force_md5)) {
+            if (g_disable_hashing) {
+                SCLogInfo(
+                        "not forcing md5 calculation for logged files: hashing globally disabled");
+            } else {
                 FileForceMd5Enable();
                 SCLogInfo("forcing md5 calculation for logged files");
             }
         }
+    }
 
     if (conf != NULL)
         forcehash_node = ConfNodeLookupChild(conf, "force-hash");
@@ -194,21 +199,36 @@ void FileForceHashParseCfg(ConfNode *conf)
 
         TAILQ_FOREACH(field, &forcehash_node->head, next) {
             if (strcasecmp("md5", field->val) == 0) {
+                if (g_disable_hashing) {
+                    SCLogInfo("not forcing md5 calculation for logged files: hashing globally "
+                              "disabled");
+                } else {
                     FileForceMd5Enable();
                     SCLogConfig("forcing md5 calculation for logged or stored files");
                 }
+            }
 
             if (strcasecmp("sha1", field->val) == 0) {
+                if (g_disable_hashing) {
+                    SCLogInfo("not forcing sha1 calculation for logged files: hashing globally "
+                              "disabled");
+                } else {
                     FileForceSha1Enable();
                     SCLogConfig("forcing sha1 calculation for logged or stored files");
                 }
+            }
 
             if (strcasecmp("sha256", field->val) == 0) {
+                if (g_disable_hashing) {
+                    SCLogInfo("not forcing sha256 calculation for logged files: hashing globally "
+                              "disabled");
+                } else {
                     FileForceSha256Enable();
                     SCLogConfig("forcing sha256 calculation for logged or stored files");
                 }
             }
         }
+    }
 }
 
 uint16_t FileFlowToFlags(const Flow *flow, uint8_t direction)