Add support for PKCS#12 private keys (bgo #558982)

	* libnm-util/crypto.c
	  libnm-util/crypto.h
		- (parse_old_openssl_key_file): rename from parse_key_file(); adapt to
			take a GByteArray instead of a filename
		- (file_to_g_byte_array): handle private key files too
		- (decrypt_key): take a GByteArray rather than data + len
		- (crypto_get_private_key_data): refactor crypto_get_private_key() into
			one function that takes a filename, and one that takes raw data;
			detect pkcs#12 files as well
		- (crypto_load_and_verify_certificate): detect file type
		- (crypto_is_pkcs12_data, crypto_is_pkcs12_file): add pkcs#12 detection
			functions

	* libnm-util/crypto_gnutls.c
		- (crypto_decrypt): take GByteArray rather than data + len; fix a bug
			whereby tail padding was incorrectly handled, leading to erroneous
			successes when trying to decrypt the data
		- (crypto_verify_cert): rework somewhat
		- (crypto_verify_pkcs12): validate pkcs#12 keys

	* libnm-util/crypto_nss.c
		- (crypto_init): enable various pkcs#12 ciphers
		- (crypto_decrypt): take a GByteArray rather than data + len
		- (crypto_verify_cert): clean up
		- (crypto_verify_pkcs12): validate pkcs#12 keys

	* libnm-util/test-crypto.c
		- Handle pkcs#12 keys

	* libnm-util/nm-setting-8021x.c
	  libnm-util/nm-setting-8021x.h
	  libnm-util/libnm-util.ver
		- Add two new properties, 'private-key-password' and
			'phase2-private-key-password', to be used in conjunction with
			pkcs#12 keys
		- (nm_setting_802_1x_set_ca_cert_from_file,
		   nm_setting_802_1x_set_client_cert_from_file,
		   nm_setting_802_1x_set_phase2_ca_cert_from_file,
		   nm_setting_802_1x_set_phase2_client_from_file): return certificate
			type
		- (nm_setting_802_1x_get_private_key_password,
		   nm_setting_802_1x_get_phase2_private_key_password): return private
			key passwords
		- (nm_setting_802_1x_set_private_key_from_file,
		   nm_setting_802_1x_set_phase2_private_key_from_file): set the private
			key from a file, and update the private key password at the same time
		- (nm_setting_802_1x_get_private_key_type,
		   nm_setting_802_1x_get_phase2_private_key_type): return the private
			key type

	* src/supplicant-manager/nm-supplicant-settings-verify.c
		- Whitelist private key passwords

	* src/supplicant-manager/nm-supplicant-config.c
		- (nm_supplicant_config_add_setting_8021x): for pkcs#12 private keys,
			add the private key password to the supplicant config, but do not
			add the client certificate (as required by wpa_supplicant)



git-svn-id: http://svn-archive.gnome.org/svn/NetworkManager/trunk@4280 4912f4e0-d625-0410-9fb7-b9a5a253dbdc