use arraymap in examples

the use of hashmaps is just hopelessly outdated.

examples/count.py

 from asyncio import get_event_loop, sleep
-from ebpfcat.hashmap import HashMap
+from ebpfcat.arraymap import ArrayMap
 from ebpfcat.xdp import XDP, XDPExitCode, XDPFlags
 
 class Count(XDP):
     license = "GPL"
 
-    userspace = HashMap()
+    userspace = ArrayMap()
     count = userspace.globalVar()
 
     def program(self):

examples/ipcounter.py

 """example program to count IPv4 and IPv6 packets"""
 
 from asyncio import get_event_loop, sleep
-from ebpfcat.hashmap import HashMap
+from ebpfcat.arraymap import ArrayMap
 from ebpfcat.xdp import PacketVar, XDP, XDPExitCode, XDPFlags
 
 class IPCount(XDP):
@@ -9,7 +9,7 @@ class IPCount(XDP):
 
     minimumPacketSize = 14
 
-    userspace = HashMap()
+    userspace = ArrayMap()
     ipv4count = userspace.globalVar()
     ipv6count = userspace.globalVar()
     ethertype = PacketVar(12, "!H")