Improve implementation coverage (and layout)

moto/ec2instanceconnect/__init__.py

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+from ..core.models import base_decorator
+from .models import ec2instanceconnect_backends
+
+mock_ec2instanceconnect = base_decorator(ec2instanceconnect_backends)

moto/ec2instanceconnect/models.py

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+import boto.ec2
+import json
+from moto.core import BaseBackend
+
+
+class Ec2InstanceConnectBackend(BaseBackend):
+    def send_ssh_public_key(self):
+        return json.dumps(
+            {"RequestId": "example-2a47-4c91-9700-e37e85162cb6", "Success": True}
+        )
+
+
+ec2instanceconnect_backends = {}
+for region in boto.ec2.regions():
+    ec2instanceconnect_backends[region.name] = Ec2InstanceConnectBackend()

moto/ec2instanceconnect/responses.py

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+from moto.core.responses import BaseResponse
+from .models import ec2instanceconnect_backends
+
+
+class Ec2InstanceConnectResponse(BaseResponse):
+    @property
+    def ec2instanceconnect_backend(self):
+        return ec2instanceconnect_backends[self.region]
+
+    def send_ssh_public_key(self):
+        return self.ec2instanceconnect_backend.send_ssh_public_key()

moto/ec2instanceconnect/urls.py

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+from __future__ import unicode_literals
+from .responses import Ec2InstanceConnectResponse
+
+url_bases = ["https?://ec2-instance-connect\.(.+)\.amazonaws\.com"]
+
+url_paths = {"{0}/$": Ec2InstanceConnectResponse.dispatch}