udhcpc: regularize the names of receiving functions,
pause on "serious failure to receive".
Some misc fixes are also folded in here.

diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index 1131bae..bf0ecc7 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -61,7 +61,9 @@
 
 void udhcp_init_header(struct dhcpMessage *packet, char type);
 
-int udhcp_recv_packet(struct dhcpMessage *packet, int fd);
+/*int udhcp_recv_raw_packet(struct dhcpMessage *payload, int fd); - in dhcpc.h */
+int udhcp_recv_kernel_packet(struct dhcpMessage *packet, int fd);
+
 int udhcp_send_raw_packet(struct dhcpMessage *payload,
 		uint32_t source_ip, int source_port,
 		uint32_t dest_ip, int dest_port,