Bugs 3525

[*] Fixed an error: dap_sign_type_from_key_type() was always returning uninitialized memory either in l_sign_type.raw or in l_sign_type.type
(Valgrind)

DAP_DELETE of an object should not be called before HASH_FIND_INT, because it contains UT_hash_handle.

Documentation:  For getsockopt(), optlen is a value-result argument, initially containing the size of the buffer pointed to by optval, and modified on return to indicate the actual size of the value returned.
Valgrind: Syscall param socketcall.getsockopt(optlen) points to uninitialised byte(s).

[*] Fixed an error. Uninitialised memory allocated in s_http_new() was used later in json_tokener_parse().
Valgrind: Use of uninitialised value of size 8.

From documentation: The addrlen argument should be initialized to indicate the amount of space pointed to by addr.
Valgrind: "Syscall param socketcall.getpeername(namelen_in) points to uninitialised byte(s)".