tcp: Reset tcp connections in SYN-SENT state

Userspace sends tcp connection (sock) destroy on network permission
change. Kernel though doesn't send reset for the connections in
SYN-SENT state and these connections continue to remain. Even as
per RFC 793, there is no hard rule to not send RST on ABORT in
this state. Modify tcp_abort and tcp_disconnect behavior to send
RST for connections in syn-sent state to avoid lingering
connections on network switch.

CRs-Fixed: 2396964
Change-Id: If931fb979e519c474697d82d8c9dbaf0edb626e3
Signed-off-by: Devi Sandeep Endluri V V <dendluri@codeaurora.org>