Allow file provider to load config from files in a directory.

integration/fixtures/file/dir/simple1.toml

@@ -0,0 +1,11 @@
+# rules
+[backends]
+  [backends.backend1]
+    [backends.backend1.servers.server1]
+    url = "http://172.17.0.2:80"
+
+[frontends]
+  [frontends.frontend1]
+  backend = "backend1"
+    [frontends.frontend1.routes.test_1]
+    rule = "Path:/test1"

integration/fixtures/file/dir/simple2.toml

@@ -0,0 +1,11 @@
+# rules
+[backends]
+  [backends.backend2]
+    [backends.backend2.servers.server1]
+    url = "http://172.17.0.2:80"
+
+[frontends]
+  [frontends.frontend2]
+  backend = "backend2"
+    [frontends.frontend2.routes.test_2]
+    rule = "Path:/test2"

integration/fixtures/file/directory.toml

@@ -0,0 +1,10 @@
+defaultEntryPoints = ["http"]
+
+logLevel = "DEBUG"
+
+[entryPoints]
+  [entryPoints.http]
+  address = ":8000"
+
+[file]
+  directory = "fixtures/file/dir/"