There are several ways to work around this problem:

(1) In a container terminal type:
$ stty /dev/null
This will force allocation of a tty and you can then connect using jboss-cli.sh normally.

(2) Pass commands to jboss-cli.sh on the command line:
$ /opt/eap/bin/jboss-cli.sh -c <command>
(example /opt/eap/bin/jboss-cli.sh -c :whoami )
Since this does not require the CLI to enter interactive mode the command will be executed and the results displayed.

(3) Use the --file parameter of jboss-cli.sh.
This will allow a file of commands to be passed to the CLI and executed, displaying the results on the screen.

Start EAP CD via docker:

$docker run jboss-eap-7-tech-preview/eap-cd-openshift

Try and use the CLI via another session: (docker container ls to find the container)

$ docker exec -it pensive_brattain /opt/eap/bin/jboss-cli.sh

[This will hang]. The same behavior is observable through OpenShift via the console tab of the running pod.

You are disconnected at the moment. Type 'connect' to connect to the server or 'help' for the list of supported commands.
Exception in thread "CLI Terminal Connection (uninterruptable)" java.lang.ArrayIndexOutOfBoundsException: 1025
at org.aesh.readline.Buffer.doInsert(Buffer.java:238)
at org.aesh.readline.Buffer.insert(Buffer.java:226)
at org.aesh.readline.AeshConsoleBuffer.writeChar(AeshConsoleBuffer.java:128)
at org.aesh.readline.Readline$AeshInputProcessor.parse(Readline.java:262)
at org.aesh.readline.Readline$AeshInputProcessor.access$100(Readline.java:174)
at org.aesh.readline.Readline.readInput(Readline.java:95)
at org.aesh.readline.Readline.access$1000(Readline.java:57)
at org.aesh.readline.Readline$AeshInputProcessor.lambda$start$1(Readline.java:333)
at org.aesh.terminal.EventDecoder.accept(EventDecoder.java:107)
at org.aesh.terminal.EventDecoder.accept(EventDecoder.java:29)
at org.aesh.io.Decoder.write(Decoder.java:133)
at org.aesh.readline.tty.terminal.TerminalConnection.openBlocking(TerminalConnection.java:212)
at org.aesh.readline.tty.terminal.TerminalConnection.openBlocking(TerminalConnection.java:199)
at org.jboss.as.cli.impl.ReadlineConsole$CLITerminalConnection.lambda$null$1(ReadlineConsole.java:171)
at java.lang.Thread.run(Thread.java:748)
java.lang.ArrayIndexOutOfBoundsException: 1024
at org.aesh.readline.Buffer.doInsert(Buffer.java:238)
at org.aesh.readline.Buffer.insert(Buffer.java:226)
at org.aesh.readline.AeshConsoleBuffer.writeChar(AeshConsoleBuffer.java:128)
at org.aesh.readline.Readline$AeshInputProcessor.parse(Readline.java:262)
at org.aesh.readline.Readline$AeshInputProcessor.access$100(Readline.java:174)
at org.aesh.readline.Readline.readInput(Readline.java:95)
at org.aesh.readline.Readline.processInput(Readline.java:164)
at org.aesh.readline.Readline.access$800(Readline.java:57)
at org.aesh.readline.Readline$AeshInputProcessor.parse(Readline.java:257)
at org.aesh.readline.Readline$AeshInputProcessor.access$100(Readline.java:174)
at org.aesh.readline.Readline.readInput(Readline.java:95)
at org.aesh.readline.Readline.processInput(Readline.java:164)
at org.aesh.readline.Readline.readline(Readline.java:154)
at org.jboss.as.cli.impl.ReadlineConsole.loop(ReadlineConsole.java:830)
at org.jboss.as.cli.impl.ReadlineConsole.lambda$null$6(ReadlineConsole.java:865)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

This is debuggable by starting the container like this:

$ docker run -p 8787:8787 jboss-eap-7-tech-preview/eap-cd-openshift
[EAP starts, 8787 in the container is mapper to 8787 on localhost]

In another terminal:
$ docker container ls
$ docker exec -it <container name> /bin/bash
$ vi /opt/eap/bin/jboss-cli.sh [enable debug, wait for debugger etc]
$ /opt/eap/bin/jboss-cli.sh
[CLI starts, and is attachable on localhost:8787 via debugger