Merge ~chad.smith/pycloudlib:ec2/list-keys into pycloudlib:master

[Chad Smith]

Add ec2.list_keys operation to allow for checking if keys exist.

It allows us to look before we leap before calling either delete_key
or upload_key.

[Server Team CI bot (server-team-bot)]

FAILED: Continuous integration, rev:92d0105a53e3a62793823978d861c5ab08b48d87
https://jenkins.ubuntu.com/server/job/pycloudlib-ci-test/32/
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review: Needs Fixing (continuous-integration)

[Chad Smith (chad.smith)]

Closing in favor or https://github.com/canonical/pycloudlib/pull/4

Unmerged commits

92d0105... by Chad Smith on 2020-07-13

ec2: add list_keys cloud operation

45b554f... by Chad Smith on 2020-07-12

paramiko bump version to 2.7.1

55cc033... by Chad Smith on 2020-07-12

update boto deps for IP support on vpc instances

diff --git a/pycloudlib/ec2/cloud.py b/pycloudlib/ec2/cloud.py
index 8944923..d542348 100644
--- a/pycloudlib/ec2/cloud.py
+++ b/pycloudlib/ec2/cloud.py
@@ -193,6 +193,12 @@ class EC2(BaseCloud):
 
         return instance
 
+    def list_keys(self):
+        keypair_names = []
+        for keypair in self.client.describe_key_pairs()["KeyPairs"]:
+            keypair_names.append(keypair["KeyName"])
+        return keypair_names
+
     def snapshot(self, instance, clean=True):
         """Snapshot an instance and generate an image from it.
 
diff --git a/requirements.txt b/requirements.txt
index 6685110..ccbdd3a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 boto3==1.14.20
 botocore==1.17.20
 google-api-python-client==1.7.7
-paramiko==2.6.0
+paramiko==2.7.1
 pyyaml==3.13
 requests==2.22