samples: echo_client: Add overlays for debugging

Add overlays that might be useful for debugging:

- overlay-log.conf
   Enable debug log for socket, context, connection, TCP/TCP2.
- overlay-debug.conf
   Disable optimization and compile with debug information.
- overlay-max-stacks.conf
   Overlay to quickly sort out insufficient stack problems.
- overlay-e1000.conf

Signed-off-by: Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>

samples/net/sockets/echo_client/overlay-debug.conf

@@ -0,0 +1,7 @@
+CONFIG_NO_OPTIMIZATIONS=y
+CONFIG_DEBUG=y
+
+CONFIG_ASSERT=y
+
+CONFIG_STACK_SENTINEL=y
+CONFIG_STACK_CANARIES=y

samples/net/sockets/echo_client/overlay-e1000.conf

@@ -0,0 +1,5 @@
+CONFIG_PCIE=y
+CONFIG_ETH_E1000=y
+
+CONFIG_NET_L2_ETHERNET=y
+CONFIG_NET_QEMU_ETHERNET=y

samples/net/sockets/echo_client/overlay-log.conf

@@ -0,0 +1,27 @@
+CONFIG_LOG=y
+CONFIG_LOG_IMMEDIATE=y
+CONFIG_LOG_BACKEND_SHOW_COLOR=n
+
+CONFIG_LOG_BUFFER_SIZE=1024
+CONFIG_LOG_STRDUP_BUF_COUNT=2048
+
+CONFIG_NET_LOG=y
+
+CONFIG_NET_SOCKETS_LOG_LEVEL_DBG=y
+CONFIG_NET_CONN_LOG_LEVEL_DBG=y
+CONFIG_NET_CONTEXT_LOG_LEVEL_DBG=y
+
+CONFIG_NET_TCP_LOG_LEVEL_DBG=y
+
+#CONFIG_NET_IF_LOG_LEVEL_DBG=y
+#CONFIG_NET_L2_ETHERNET_LOG_LEVEL_DBG=y
+
+#CONFIG_SLIP_LOG_LEVEL_DBG=y
+
+#CONFIG_ETHERNET_LOG_LEVEL_DBG=y
+#CONFIG_ETH_E1000_VERBOSE_DEBUG=y
+
+#CONFIG_NET_PKT_LOG_LEVEL_DBG=y
+
+#CONFIG_NET_BUF_LOG=y
+#CONFIG_NET_BUF_LOG_LEVEL_DBG=y

samples/net/sockets/echo_client/overlay-max-stacks.conf

@@ -0,0 +1,12 @@
+CONFIG_NET_MGMT_EVENT_STACK_SIZE=65535
+CONFIG_PRIVILEGED_STACK_SIZE=65535
+CONFIG_NET_TX_STACK_SIZE=65535
+CONFIG_NET_RX_STACK_SIZE=65535
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=65535
+CONFIG_MAIN_STACK_SIZE=65535
+CONFIG_IDLE_STACK_SIZE=65535
+CONFIG_ISR_STACK_SIZE=65535
+CONFIG_OFFLOAD_WORKQUEUE_STACK_SIZE=65535
+CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=65535
+CONFIG_NET_CONNECTION_MANAGER_STACK_SIZE=65535
+CONFIG_SHELL_STACK_SIZE=65535