Implement host probing retry with major refactoring

- Implement probe retry
- Switch to typical core/provider design pattern for HostProbingService
  and as a result decoupling the dependency between SR and HostLocationProvider

Change-Id: I33a15af580677ea376b421ac3e26f9821dcca844
diff --git a/providers/hostprobing/BUCK b/providers/hostprobing/BUCK
new file mode 100644
index 0000000..21bf493
--- /dev/null
+++ b/providers/hostprobing/BUCK
@@ -0,0 +1,22 @@
+COMPILE_DEPS = [
+    '//lib:CORE_DEPS',
+    '//incubator/api:onos-incubator-api',
+]
+
+TEST_DEPS = [
+    '//lib:TEST_ADAPTERS',
+    '//utils/osgi:onlab-osgi-tests',
+]
+
+osgi_jar_with_tests (
+    deps = COMPILE_DEPS,
+    test_deps = TEST_DEPS,
+)
+
+onos_app (
+    app_name = 'org.onosproject.hostprobingprovider',
+    title = 'Host Probing Provider',
+    category = 'Provider',
+    url = 'http://onosproject.org',
+    description = 'Provides host probing mechanism that discovers or verifies the existence of a host at specific location',
+)