LIMS-1621: Support webcam auth

[ndg63276]

JIRA ticket: LIMS-1621

Summary:

If the webcams require a username and password to view, this can be added to the address in the config file, but that will be ignored without telling curl to use it.

Changes:

• Allow curl to use any suitable auth method

To test:

• Get the i19 webcam username and password from Mark or Sarah Barnett
• Update the $webcams array in the config, to set (with real credentials)

'i03' => array('172.23.103.177', '172.23.103.176'),
'i19-1' => array('user:[email protected]', 'user:[email protected]'),
'i19-2' => array('user:[email protected]', 'user:[email protected]'),

• Log in to proposal cm40638, then go to /status/bl/i19-1, check the webcams work
• Do the same for cm40607 and /status/bl/i03, check the webcams still work