Updated copyright notices to include the year 2018.

global: stop including fd-set-nonblock.h & fd-close-on-exec.h directly

global: start relying on [io]_stream_unref(NULL) being a no-op Cleanup performed with the following semantic patch: @@ expression E; @@ - if (E != NULL) { - i_stream_unref(&E); - } + i_stream_unref(&E); @@ expression E; @@ - if (E != NULL) { - o_stream_unref(&E); - } + o_stream_unref(&E);

global: start relying on i_close_fd(-1) being a no-op Cleanup performed with the following semantic patch: @@ expression E; @@ - if (E != -1) - i_close_fd(&E); + i_close_fd(&E);

lib-imap-client: Fix hang when imapc_client_get_capabilities() is called without connection

lib-imap-client: Fix test-imapc-client unit test to work on OSX connect() to port 0 fails in it, so for the "connect failure" test first open a random free listener port and then close it. Hopefully nothing else reopens it in the mean time.

lib-imap-client: Fixes to unit test

lib-imap-client: Add unit test Initially this tests some connection and reconnection problems.