Fix bookkeeping package tests

[joe94]

The bookkeeping package tests fail intermittently. Since the package is not being used anywhere, the tests were ignored until this issue is resolved.

=== RUN   TestReturnHeadersWithPrefix/9
    TestReturnHeadersWithPrefix/9: requestResponse_test.go:189: struct { request *http.Request; prefixs []string; expectedKV []interface {} }{request:(*http.Request)(0xc0000cb400), prefixs:[]string{"X-TEST-3", "x-TEsT-1", "x-TesT-2"}, expectedKV:[]interface {}{"X-Test-1", []string{"foo"}, "X-Test-2", []string{"foo", "bar"}}}
=== RUN   TestReturnHeadersWithPrefix/10
    TestReturnHeadersWithPrefix/10: requestResponse_test.go:189: struct { request *http.Request; prefixs []string; expectedKV []interface {} }{request:(*http.Request)(0xc0000cb500), prefixs:[]string{"X-TEST"}, expectedKV:[]interface {}{"X-Test-1", []string{"foo"}, "X-Test-2", []string{"foo", "bar"}}}
    TestReturnHeadersWithPrefix/10: requestResponse_test.go:120: 
        Expecting: (map[string]interface {}) (len=1) {
         (string) (len=4) "test": ([]string) (len=2 cap=2) {
          (string) (len=3) "foo",
          (string) (len=3) "bar"
         }
        }
        
         but got: (map[string]interface {}) (len=1) {
         (string) (len=4) "test": ([]string) (len=1 cap=1) {
          (string) (len=3) "foo"
         }
        }
        
--- FAIL: TestReturnHeadersWithPrefix (0.01s)
    --- PASS: TestReturnHeadersWithPrefix/0 (0.00s)
    --- PASS: TestReturnHeadersWithPrefix/1 (0.00s)
    --- PASS: TestReturnHeadersWithPrefix/2 (0.00s)
    --- PASS: TestReturnHeadersWithPrefix/3 (0.00s)
    --- PASS: TestReturnHeadersWithPrefix/4 (0.00s)
    --- PASS: TestReturnHeadersWithPrefix/5 (0.00s)
    --- PASS: TestReturnHeadersWithPrefix/6 (0.00s)
    --- PASS: TestReturnHeadersWithPrefix/7 (0.00s)
    --- PASS: TestReturnHeadersWithPrefix/8 (0.00s)
    --- PASS: TestReturnHeadersWithPrefix/9 (0.00s)
    --- FAIL: TestReturnHeadersWithPrefix/10 (0.00s)
=== RUN   TestRequestBody
=== RUN   TestRequestBody/0
    TestRequestBody/0: requestResponse_test.go:215: struct { request *http.Request; expected []interface {} }{request:(*http.Request)(0xc00019ea00), expected:[]interface {}{"req-body", "empty body"}}
=== RUN   TestRequestBody/1
    TestRequestBody/1: requestResponse_test.go:215: struct { request *http.Request; expected []interface {} }{request:(*http.Request)(0xc00019eb00), expected:[]interface {}{"req-body", "payload"}}
--- PASS: TestRequestBody (0.00s)
    --- PASS: TestRequestBody/0 (0.00s)
    --- PASS: TestRequestBody/1 (0.00s)
=== RUN   TestResponseBody
=== RUN   TestResponseBody/0
    TestResponseBody/0: requestResponse_test.go:241: struct { response bookkeeping.CapturedResponse; expected []interface {} }{response:bookkeeping.CapturedResponse{Code:0, Payload:[]uint8(nil), Header:http.Header(nil)}, expected:[]interface {}{"res-body", "empty body"}}
=== RUN   TestResponseBody/1
    TestResponseBody/1: requestResponse_test.go:241: struct { response bookkeeping.CapturedResponse; expected []interface {} }{response:bookkeeping.CapturedResponse{Code:0, Payload:[]uint8{0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64}, Header:http.Header(nil)}, expected:[]interface {}{"res-body", "payload"}}
--- PASS: TestResponseBody (0.00s)
    --- PASS: TestResponseBody/0 (0.00s)
    --- PASS: TestResponseBody/1 (0.00s)
FAIL
coverage: 83.8% of statements
FAIL	github.com/xmidt-org/webpa-common/bookkeeping	0.036s

Source: https://travis-ci.org/github/xmidt-org/webpa-common/jobs/670759741?utm_medium=notification&utm_source=github_status