Capitalized "[Return]" to adhere to code standards.

Capitalized "[Return]" in places it wasn't.
This commit is style changes only.

Change-Id: I218c87c136ead38af3e310aa2711efaa00df2ca4
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/tests/test_networkd.robot b/tests/test_networkd.robot
index 1e084fc..242b163 100755
--- a/tests/test_networkd.robot
+++ b/tests/test_networkd.robot
@@ -151,7 +151,7 @@
     ${json}=   to json         ${resp.content}
     log to console   ${json['data'][2]}
     log to console   ${json['data'][3]}
-    [return]    ${json}
+    [Return]    ${json}
 
 AddNetworkInfo
     [Arguments]    ${intf}      ${address}    ${mask}   ${gateway}  ${result}