test case xml update

Author: sunilit42

app/code/Magento/Sitemap/Test/Unit/Model/_files/sitemap-1-1.xml

@@ -6,7 +6,6 @@
  */
 -->
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
-        xmlns:content="http://www.google.com/schemas/sitemap-content/1.0"
         xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
     <url>
         <loc>http://store.com/category.html</loc>

app/code/Magento/Sitemap/Test/Unit/Model/_files/sitemap-1-2.xml

@@ -6,7 +6,6 @@
  */
 -->
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
-        xmlns:content="http://www.google.com/schemas/sitemap-content/1.0"
         xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
     <url>
         <loc>http://store.com/category/sub-category.html</loc>

app/code/Magento/Sitemap/Test/Unit/Model/_files/sitemap-1-3.xml

@@ -6,7 +6,6 @@
  */
 -->
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
-        xmlns:content="http://www.google.com/schemas/sitemap-content/1.0"
         xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
     <url>
         <loc>http://store.com/product.html</loc>

app/code/Magento/Sitemap/Test/Unit/Model/_files/sitemap-1-4.xml

@@ -6,7 +6,6 @@
  */
 -->
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
-        xmlns:content="http://www.google.com/schemas/sitemap-content/1.0"
         xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
     <url>
         <loc>http://store.com/product2.html</loc>

app/code/Magento/Sitemap/Test/Unit/Model/_files/sitemap-single.xml

@@ -6,7 +6,6 @@
  */
 -->
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
-        xmlns:content="http://www.google.com/schemas/sitemap-content/1.0"
         xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
     <url>
         <loc>http://store.com/category.html</loc>