Use ewsc 0.2.0

Eliminates exception on exec against terminating pod, therefore mitigation
code avoiding crash on that is removed.

More details on the issue:
aialferov/ewsc@7f6de55

rebar.config

@@ -1,7 +1,7 @@
 {deps, [
     {cpflib, {git, "git://github.com/aialferov/cpflib", {tag, "master"}}},
     {hackney, {git, "git://github.com/benoitc/hackney.git", {tag, "1.11.0"}}},
-    {ewsc, {git, "git://github.com/aialferov/ewsc", {tag, "master"}}},
+    {ewsc, {git, "git://github.com/aialferov/ewsc", {tag, "0.2.0"}}},
     {jsx, {git, "https://github.com/talentdeficit/jsx.git", {tag, "master"}}}
 ]}.
 {plugins, [

src/kube-vxlan-controller.app.src.script

@@ -1,6 +1,6 @@
 {application, 'kube-vxlan-controller', [
     {description, "Kubernetes VXLAN contoller"},
-    {vsn, "0.10.2"},
+    {vsn, "0.10.3"},
     {modules, []},
     {applications, [kernel, stdlib, inets, cpflib, hackney, ewsc, jsx]},
     {env, [

src/kube_vxlan_controller_pod.erl

@@ -51,7 +51,7 @@ exec(Namespace, PodName, ContainerName, Command, Config) ->
         lists:reverse(string:split(Command, " ", all))
     ),
 
-    try ?K8s:ws_connect(Resource, Query, Config) of
+    case ?K8s:ws_connect(Resource, Query, Config) of
         {ok, Socket} ->
             case ?K8s:ws_recv(Socket) of
                 {ok, Result} ->
@@ -66,10 +66,6 @@ exec(Namespace, PodName, ContainerName, Command, Config) ->
         {error, Reason} ->
             ?Log:error(Reason),
             ""
-    catch
-        _ClassN:_ExceptionPatternN:Stacktrace ->
-            ?Log:error(Stacktrace),
-            ""
     end.
 
 fmt(Format, Args) -> lists:flatten(io_lib:format(Format, Args)).