Rename to citadel: Update README

This change updates the README to refer to the daemon as "citadel"
or "c5l" for short.  KMS now only refers to the Kubernetes interface.

Signed-off-by: Monis Khan <mkhan@redhat.com>

README.md

@@ -1,21 +1,21 @@
-# Welcome to KMS!
+# Welcome to Citadel!
 
-KMS is a simple daemon that implements the Kubernetes Key Management Service
+Citadel (c5l) is a simple daemon that implements the Kubernetes Key Management Service (KMS)
 interface by acquiring a key encryption key (KEK) from an arbitrary command.
 This makes it easy to plug in your own key management solution as a simple unix
 command that returns the KEK.
 
 ## How does it work?
 
-When KMS starts, it runs the command you provide it. This command returns the
-KEK on standard output. If this command fails during startup, the KMS will exit.
+When c5l starts, it runs the command you provide it. This command returns the
+KEK on standard output. If this command fails during startup, c5l will exit.
 Otherwise, it will use the KEK from the command to encrypt and decrypt input
 from Kubernetes.
 
-KMS caches the KEK, and thus does not call the command on every incoming
+c5l caches the KEK, and thus does not call the command on every incoming
 request. The time limit of this cache is specified by the `timeout` argument.
-If the KMS is not able to refresh the cache after trying several times, it will
-purge the KEK and report errors to Kubernetes. If the KMS eventually succeeds
+If c5l is not able to refresh the cache after trying several times, it will
+purge the KEK and report errors to Kubernetes. If c5l eventually succeeds
 in acquiring the KEK, normal operation will resume.
 
 To specify the socket to create, use the `endpoint` argument. Otherwise,
@@ -29,7 +29,7 @@ socket activation is assumed.
 
 ### Optional
 
- * `--endpoint string`: the listen address (ex. `unix:///tmp/kms.sock`)
+ * `--endpoint string`: the listen address (ex. `unix:///tmp/socket`)
 
  * `--timeout duration`: maximum time to cache KEK locally (default 1h)