Modified certificate generation to address issues #234 and #228 (#235)

* Modified certificate generation to address issues #234 and #228

I have made the following modifications to comply with the IKEv2 client certificate requirements:

- Changed client certificate CN to {{ IP_subject_alt_name }}_{{ item }} from {{ item }}
- Changed client certificate SAN to {{IP_subject_alt_name }} from {{ item }}
- Added clientAuth to client certificate EKU

I have made the following changes to address a mismatch in the windows deployment script and file names:

- Changed the client certificate (.p12) filename in config/{{ IP_subject_alt_name }} to {{ IP_subject_alt_name}}_{{ item }}.p12 from {{ item }}.p12 to match the ps1 script

Testing:

I have tested the changes on Windows 10 client, Ubuntu 16.04.1 server (DigitalOcean) - the config described in Issue #234

I apologize for not being able to test on other configurations. I hope that someone else can verify my changes

* fixed iOS issues

* fixed accidentall user change

* simplified changes

* Final iteration. I think that's all I can do to minimize the changes

roles/vpn/templates/client_windows.ps1.j2

@@ -1,3 +1,3 @@
-certutil -f -p {{ easyrsa_p12_export_password }} -importpfx .\{{ IP_subject_alt_name }}_{{ item }}.p12
+certutil -f -p {{ easyrsa_p12_export_password }} -importpfx .\{{ item }}.p12
 Add-VpnConnection -name "Algo" -ServerAddress "{{ IP_subject_alt_name }}" -TunnelType IKEv2 -AuthenticationMethod MachineCertificate -EncryptionLevel Required
 Set-VpnConnectionIPsecConfiguration -ConnectionName "Algo" -AuthenticationTransformConstants SHA256128 -CipherTransformConstants AES256 -EncryptionMethod AES256 -IntegrityCheckMethod SHA256 -DHGroup Group14 -PfsGroup none

roles/vpn/templates/openssl.cnf.j2

@@ -108,7 +108,7 @@ basicConstraints	= CA:FALSE
 subjectKeyIdentifier	= hash
 authorityKeyIdentifier	= keyid,issuer:always
 
-extendedKeyUsage = serverAuth,1.3.6.1.5.5.7.3.17
+extendedKeyUsage = serverAuth,clientAuth,1.3.6.1.5.5.7.3.17
 keyUsage = digitalSignature, keyEncipherment
 subjectAltName = ${ENV::subjectAltName}