Fix 'ExpectationFailedError' errors in MPU test files due to incorrect "Expect" header usage

Many MPU tests were setting "Expect: application/json", a presumed
accidental misspelling of the "Accept" header. The only valid value
for the "Expect" header is "100-continue". Old muskie was using
node 0.10. Sometime after 0.10 nodejs/node#4501
changed node behaviour to respond with 417 Expectation Failed if given
a bogus "Expect" header.

Author: trentm

test/mpu/abort.test.js

@@ -150,7 +150,7 @@ test('abort upload: non-uuid id', function (t) {
     var options = {
         headers: {
             'content-type': 'application/json',
-            'expect': 'application/json'
+            'accept': 'application/json'
         },
         path: '/' + this.client.user + '/uploads/f/' + bogus + '/' + action
     };

test/mpu/auth.test.js

@@ -239,7 +239,7 @@ test('POST /:account/uploads/[0-f]/:id disallowed', function (t) {
         var opts = {
             headers: {
                 'content-type': 'application/json',
-                'expect': 'application/json'
+                'accept': 'application/json'
             },
             path: self.uploadPath()
         };
@@ -359,7 +359,7 @@ test('POST /:account/uploads/[0-f]/:id/state disallowed', function (t) {
         var opts = {
             headers: {
                 'content-type': 'application/json',
-                'expect': 'application/json'
+                'accept': 'application/json'
             },
             path: p
         };
@@ -664,7 +664,7 @@ test('POST /:account/uploads/[0-f]/:id/:partNum disallowed', function (t) {
             var opts = {
                 headers: {
                     'content-type': 'application/json',
-                    'expect': 'application/json'
+                    'accept': 'application/json'
                 },
                 path: self.uploadPath(pn)
             };

test/mpu/commit.test.js

@@ -785,7 +785,7 @@ test('commit upload: non-uuid id', function (t) {
     var options = {
         headers: {
             'content-type': 'application/json',
-            'expect': 'application/json'
+            'accept': 'application/json'
         },
         path: '/' + this.client.user + '/uploads/f/' + bogus + '/' + action
     };

test/mpu/get.test.js

@@ -49,7 +49,7 @@ test('get upload: non-uuid id', function (t) {
     var options = {
         headers: {
             'content-type': 'application/json',
-            'expect': 'application/json'
+            'accept': 'application/json'
         }
     };
 

test/mpu/redirect.test.js

@@ -134,7 +134,7 @@ test('redirect upload: POST /:account/uploads/:id', function (t) {
         var options = {
             headers: {
                 'content-type': 'application/json',
-                'expect': 'application/json'
+                'accept': 'application/json'
             },
             path: self.redirectPath()
         };
@@ -282,7 +282,7 @@ test('redirect upload: POST /:account/uploads/:id/:partNum', function (t) {
         var options = {
             headers: {
                 'content-type': 'application/json',
-                'expect': 'application/json'
+                'accept': 'application/json'
             },
             path: self.redirectPath(pn)
         };