fix(net,linux): fix decodeaddress if Big Endian

[shirou]

fixes #990

Check endian when decode address.

[zhsj]

With this patch, Test_Connections pass on s390x, but a new test fails:

--- FAIL: TestDecodeAddress (0.00s)
    net_linux_test.go:173:
                Error Trace:    net_linux_test.go:173
                Error:          Not equal:
                                expected: "10.0.0.5"
                                actual  : "5.0.0.10"

                                Diff:
                                --- Expected
                                +++ Actual
                                @@ -1 +1 @@
                                -10.0.0.5
                                +5.0.0.10
                Test:           TestDecodeAddress
                Messages:       0500000A:0016
    net_linux_test.go:173:
                Error Trace:    net_linux_test.go:173
                Error:          Not equal:
                                expected: "127.0.0.1"
                                actual  : "1.0.0.127"

                                Diff:
                                --- Expected
                                +++ Actual
                                @@ -1 +1 @@
                                -127.0.0.1
                                +1.0.0.127
                Test:           TestDecodeAddress
                Messages:       0100007F:D1C2
FAIL

[shirou]

@zhsj fix tests. Could you try again?

[zhsj]

Now the tests have passed, except TestCpuInfo, but it's unrelated to this PR.