Update reducers to reflect new field helper location

ui/spec/shared/reducers/helpers/fieldSpec.js

@@ -1,4 +1,4 @@
-import {numFunctions} from 'utils/fields'
+import {numFunctions} from 'shared/reducers/helpers/field'
 
 describe('Formatting helpers', () => {
   describe('formatBytes', () => {

ui/src/data_explorer/components/FieldListItem.js

@@ -2,7 +2,11 @@ import React, {PropTypes, Component} from 'react'
 import classnames from 'classnames'
 
 import FunctionSelector from 'shared/components/FunctionSelector'
-import {numFunctions, firstFieldName, functionNames} from 'utils/fields'
+import {
+  numFunctions,
+  firstFieldName,
+  functionNames,
+} from 'shared/reducers/helpers/field'
 
 class FieldListItem extends Component {
   constructor(props) {

ui/src/shared/components/FieldList.js

@@ -8,7 +8,7 @@ import FancyScrollbar from 'shared/components/FancyScrollbar'
 
 import {showFieldKeys} from 'shared/apis/metaQuery'
 import showFieldKeysParser from 'shared/parsing/showFieldKeys'
-import {numFunctions} from 'utils/fields'
+import {numFunctions} from 'shared/reducers/helpers/field'
 
 class FieldList extends Component {
   constructor(props) {

ui/src/utils/queryTransitions.js

@@ -1,7 +1,7 @@
 import defaultQueryConfig from 'utils/defaultQueryConfig'
 import {DEFAULT_DASHBOARD_GROUP_BY_INTERVAL} from 'shared/constants'
 import {DEFAULT_DATA_EXPLORER_GROUP_BY_INTERVAL} from 'src/data_explorer/constants'
-import {hasField, removeField} from 'utils/fields'
+import {hasField, removeField} from 'shared/reducers/helpers/fields'
 import _ from 'lodash'
 
 export function editRawText(query, rawText) {