gstlal_inspiral, gstlal_ll_inspiral_plot_sensitivity: fix StringIO calls

gstlal-inspiral/bin/gstlal_inspiral

@@ -740,7 +740,7 @@ for output_file_number, (svd_bank_url_dict, output_url, ranking_stat_output_url,
 		xmldoc = ligolw.Document()
 		xmldoc.appendChild(ligolw.LIGO_LW())
 		map(xmldoc.childNodes[-1].appendChild(sngl_inspiral_table.copy()).append, sngl_inspiral_table)
-		output = StringIO.StringIO()
+		output = StringIO()
 		ligolw_utils.write_fileobj(xmldoc, output, compress = "gz")
 		outstr = output.getvalue()
 		output.close()

gstlal-inspiral/bin/gstlal_ll_inspiral_plot_sensitivity

@@ -94,7 +94,7 @@ if options.png_output:
 	fig.savefig(options.png_output, format="png", additional_artists=[lgd1, lgd2], bbox_inches=matplotlib.transforms.Bbox([[0.,0.],[options.width,options.height]]))
 
 if options.base64:
-	f = StringIO.StringIO()
+	f = StringIO()
 	fig.savefig(f, format="png", additional_artists=[lgd1, lgd2], bbox_inches=matplotlib.transforms.Bbox([[0.,0.],[options.width,options.height]]))
 	with open('./sensitivity_base64.txt','w') as sensitivity_file:
 		sensitivity_file.write(base64.b64encode(f.getvalue()))