client scripts require the control key to submit commands in Windows Powershell

I have verified this on both 4.2.1 and master.

Steps to reproduce:

• Run karaf in Windows
• Run the client.bat script from within Powershell
• Type in a command
• Press enter (does not submit the command)
• Press control+enter (command is submitted)

I've also noticed some of the encoding is messed up, and backspace does not work correctly. I had to use control+c to undo any text I typed into the console.

I believe it's an issue with jline. I was able to swap out jline 3.9.0 for 3.6.2 in the karaf 4.2.1 distribution, and the bug went away.