dev-environment: improve readability of qemu commands

The QEMU commands are so long that they are nearly impossible to read
or review when changes are made.  Attempt to make review easier by
splitting the lines up a bit.

Signed-off-by: Patrick Williams <[email protected]>
Change-Id: I4f348bc61f5d81d643839ef33be7135b0741c102

Author: williamspatrick

development/dev-environment.md

@@ -160,15 +160,21 @@ That's it, you now have a working development environment for OpenBMC!
   up some host ports to the REST, SSH and IPMI ports in your QEMU session. In this
   example, it just uses 2222, 2443, 2623. You can use whatever you prefer.
   ```
-  ./qemu-system-arm -m 256 -M romulus-bmc -nographic -drive file=./obmc-phosphor-image-romulus.static.mtd,format=raw,if=mtd -net nic -net user,hostfwd=:127.0.0.1:2222-:22,hostfwd=:127.0.0.1:2443-:443,hostfwd=udp:127.0.0.1:2623-:623,hostname=qemu
+  ./qemu-system-arm -m 256 -M romulus-bmc -nographic \
+      -drive file=./obmc-phosphor-image-romulus.static.mtd,format=raw,if=mtd \
+      -net nic \
+      -net user,hostfwd=:127.0.0.1:2222-:22,hostfwd=:127.0.0.1:2443-:443,hostfwd=udp:127.0.0.1:2623-:623,hostname=qemu
   ```
 
    **Note** - By default, Jenkins and openbmc-test-automation use SSH and HTTPS
    ports 22 and 443, respectively. For the IPMI port 623 is used. SSH connection
    to use a user-defined port 2222 might not be successful. To use SSH port 22,
    HTTPS port 443 and IPMI port 623:
    ```
-   ./qemu-system-arm -m 256 -machine romulus-bmc -nographic -drive file=./obmc-phosphor-image-romulus.static.mtd,format=raw,if=mtd -net nic -net user,hostfwd=:127.0.0.1:22-:22,hostfwd=:127.0.0.1:443-:443,hostfwd=tcp:127.0.0.1:80-:80,hostfwd=tcp:127.0.0.1:2200-:2200,hostfwd=udp:127.0.0.1:623-:623,hostfwd=udp:127.0.0.1:664-:664,hostname=qemu
+   ./qemu-system-arm -m 256 -machine romulus-bmc -nographic \
+       -drive file=./obmc-phosphor-image-romulus.static.mtd,format=raw,if=mtd \
+       -net nic \
+       -net user,hostfwd=:127.0.0.1:22-:22,hostfwd=:127.0.0.1:443-:443,hostfwd=tcp:127.0.0.1:80-:80,hostfwd=tcp:127.0.0.1:2200-:2200,hostfwd=udp:127.0.0.1:623-:623,hostfwd=udp:127.0.0.1:664-:664,hostname=qemu
    ```
 
 4. Wait for your QEMU-based BMC to boot