tweak to compile with gcc 4.7.2

clustering/administration/http/log_app.cc: In member function 'virtual http_res_t log_http_app_t::handle(const http_req_t&)':
clustering/administration/http/log_app.cc:85:86: error: narrowing conversion of '(((long long int)time(0u)) + 1000ll)' from 'long long int' to '__time_t {aka long int}' inside { } is ill-formed in C++11 [-Werror=narrowing]
Merge review 185 by @srh