[ONOS-4797] Implement the Driver for handling Arista switch

Arista switch with its recent network OS, EOS, supports remote configuration & control. The protocol for this is Arista's proprietary but REST style.
Since ONOS has already REST southbound protocol, the control of Arista switch can be easily done by using this.

- Implemnted driver Loader for Arista switch
- Implemented DeviceDescriptionDiscovery for Arista switch
- [Deleted] Implemented the method sending post to Arista switch and return the result as a String

Change-Id: I9d4b8f0d707361949ff530ff414adb0437ae87d9
diff --git a/drivers/arista/BUCK b/drivers/arista/BUCK
new file mode 100644
index 0000000..2de78bc
--- /dev/null
+++ b/drivers/arista/BUCK
@@ -0,0 +1,28 @@
+COMPILE_DEPS = [
+    '//lib:CORE_DEPS',
+    '//lib:javax.ws.rs-api',
+    '//incubator/api:onos-incubator-api',
+    '//utils/rest:onlab-rest',
+    '//drivers/utilities:onos-drivers-utilities',
+    '//protocols/rest/api:onos-protocols-rest-api',
+]
+
+TEST_DEPS = [
+    '//lib:TEST_ADAPTERS',
+    '//core/api:onos-api-tests',
+]
+
+osgi_jar_with_tests (
+    deps = COMPILE_DEPS,
+    test_deps = TEST_DEPS,
+    resources_root = 'src/main/resources',
+    resources = glob(['src/main/resources/**']),
+)
+
+onos_app (
+    title = 'Arista Device Drivers',
+    category = 'Drivers',
+    url = 'http://onosproject.org',
+    description = 'ONOS Arista Device Drivers application.',
+    required_apps = [ 'org.onosproject.restsb' ],
+)
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