Please review: [389 Project] #48032: change C code license to GPLv3

[Noriko Hosoi]

https://fedorahosted.org/389/ticket/48032

https://fedorahosted.org/389/attachment/ticket/48032/0001-Ticket-48032-48033...
git patch file (master) -- LICENSE LICENSE.GPLv3+ LICENSE.openssl 
(deleting EXCEPTION)

https://fedorahosted.org/389/attachment/ticket/48032/0001-Ticket-48032-48033...
git patch file (master) -- Each source file refers the LICENSE file.