Adding Remote hw_target support in Vivado backend with 'hw_server_url' tool option.

[faberc]

Added support for 'hw_server_url' tool option for Vivado backend, which takes the string (url and port) provided and passes it to the 'connect_hw_server' command in the program.tcl template with the "-url" tag, outputting the following command: connect_hw_server -url <hw_server_url> if the hw_server_url is provided as a tool option for target.