Fixed Broken parsing of some errors in AzureBlobStorage adapter
Fixed Broken parsing of some errors in AzureBlobStorage adapter

Sometimes Azure Blob Storage returns HTML 4.0 messages as error message so they can't be correctly parsed with `simplexml_load_string`.

This pull request fixes the problem.
KnpLabs/Gaufrette,watermanio/Gaufrette,Consoneo/Gaufrette,igormukhingmailcom/Gaufrette,ronaldlopez/Gaufrette,jenkoian/Gaufrette,watermanio/Gaufrette,jenkoian/Gaufrette,NiR-/Gaufrette,KnpLabs/Gaufrette,acucchieri/Gaufrette,1001Pharmacies/Gaufrette,WayOfBrave/Gaufrette,igormukhingmailcom/Gaufrette,ronaldlopez/Gaufrette,NiR-/Gaufrette,1001Pharmacies/Gaufrette,peelandsee/Gaufrette,WayOfBrave/Gaufrette,acucchieri/Gaufrette