use a second map for SingleWriterBpfMap test because the shared r/w lock on the first conflicts with the exclusive r/w lock on the second This fixes roughly *half* the BpfMapTest tests. Test: TreeHugger, atest BpfMapTest less broken Signed-off-by: Maciej Żenczykowski <maze@google.com> Change-Id: I9d500597cad16bb7756df3e6feb9a7aa762e59d9