Rename solution files to referece VS2017

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
diff --git a/scripts/generate_visualc_files.pl b/scripts/generate_visualc_files.pl
index 96ade2f..272337c 100755
--- a/scripts/generate_visualc_files.pl
+++ b/scripts/generate_visualc_files.pl
@@ -13,12 +13,12 @@
 use strict;
 use Digest::MD5 'md5_hex';
 
-my $vsx_dir = "visualc/VS2013";
+my $vsx_dir = "visualc/VS2017";
 my $vsx_ext = "vcxproj";
-my $vsx_app_tpl_file = "scripts/data_files/vs2013-app-template.$vsx_ext";
-my $vsx_main_tpl_file = "scripts/data_files/vs2013-main-template.$vsx_ext";
+my $vsx_app_tpl_file = "scripts/data_files/vs2017-app-template.$vsx_ext";
+my $vsx_main_tpl_file = "scripts/data_files/vs2017-main-template.$vsx_ext";
 my $vsx_main_file = "$vsx_dir/mbedTLS.$vsx_ext";
-my $vsx_sln_tpl_file = "scripts/data_files/vs2013-sln-template.sln";
+my $vsx_sln_tpl_file = "scripts/data_files/vs2017-sln-template.sln";
 my $vsx_sln_file = "$vsx_dir/mbedTLS.sln";
 
 my $programs_dir = 'programs';