[dts] [v2,] framework: fix session output

[Pattan, Reshma]

> -----Original Message-----
> From: Tu, Lijuan <lijuan.tu at intel.com>
> Sent: Thursday, August 5, 2021 10:42 AM
> To: dts at dpdk.org; Pattan, Reshma <reshma.pattan at intel.com>
> Cc: Tu, Lijuan <Lijuan.Tu at intel.com>
> Subject: [v2,] framework: fix session output
> 
> * it should flush buffer before getting output
> * fix strip space in all session output
> * fix some output don't have \r\n before [PEXPECT]
> 
> Signed-off-by: Lijuan Tu <lijuan.tu at intel.com>
> Reported-by: Reshma Pattan <reshma.pattan at intel.com>

You can rebase this and apply. 

Tested-by: Reshma Pattan <reshma.pattan at intel.com>