MUC: Memcache server configuration too sensitive to whitespace

NOTE: Test requires access to dataroot directory. 1. Go to cache configuration page (System admin/Plugins/Caching/Configuration). 2. Under 'Installed cache stores', click 'Add instance' in the memcache row 3. For store name, type 'Test'. For servers, type: ' test.example.org ' (with spaces at start and end), then hit return to add a line feed after the single line. Also add a line like ' test.example.org:12345 ' (including extra space) 4. Save changes. 5. In the dataroot directory, find the file muc/config.php. Search for 'Test' and look for the servers array. EXPECTED: The servers array should have a single entry 0 => 0 => 'test.example.org'. BEFORE FIX: The array has two entries, one of which is test.example.org but surrounded by spaces and with a carriage return after it, and the other is an empty string. Repeat with Memcached