Updates an existing distribution point by name

<distribution_point>
	<name>New York Share</name>
	<ip_address>ny.company.com</ip_address>
	<is_master>true</is_master>
	<enable_load_balancing>false</enable_load_balancing>
	<ssh_username>casperadmin</ssh_username>
	<password>password</password>
	<connection_type>SMB</connection_type>
	<share_name>Caspershare</share_name>
	<workgroup_or_domain>COMPANY</workgroup_or_domain>
	<share_port>139</share_port>
	<read_only_username>casperinstall</read_only_username>
	<read_only_password>password</read_only_password>
	<read_write_username>casperwrite</read_write_username>
	<read_write_password>password</read_write_password>
	<http_downloads_enabled>true</http_downloads_enabled>
	<http_url>http://ny.company.com/CasperShare</http_url>
	<context>CasperShare</context>
	<protocol>http</protocol>
	<port>80</port>
	<no_authentication_required>false</no_authentication_required>
	<username_password_required>true</username_password_required>
	<http_username>casperinstall</http_username>
	<http_password>password</http_password>
</distribution_point>