link: Set prefixLen for loopback address

The prefixLen for a loopback address is well-defined (/8),
and as such the variable is set accordingly.

Signed-off-by: Olivier Tilmans <olivier.tilmans@uclouvain.be>

Fix documentation of failMode in OVSSwitch

In the long run, we should debug the performance issues
with kvm and Ubuntu 15. For now, however, we're relaxing
the constraints.

Closes #594

In the long run we should troubleshoot the performance issue
on kvm/Ubuntu15, but for now we are relaxing the constraint.

Closes #593

Previously we were using both ip link and ifconfig - not only is
this inconsistent and redundant, but it also broke when newer
ip link changed the reported names of certain interfacs to
"h1-eth0@36:".

Fixes #592

It's a bad idea for all Mininet VMs to share the same SSH keys.
Certainly users can regenerate their own keys, but it's better
if we don't ship a key and simply regenerate it on boot.

This still isn't ideal - this was breaking UDP iperf, which
can take a bit of time to print its output after you control-c it.

Also clarified the code in test_simpleperf.py.

Fixes #590

Keeping "use" for now even though it seems harder to remember
than "run". And the build/test options are probably much
clearer being inline in the help.

This is more complicated than it should be. We are also relying on
the fact that waitOutput should eat extra prompts most of the time.
Still not perfect - it's hard to get this exactly right, and we
should try to make it easier!

Fixes #589

It appears that read() has been blocking for some time,
so for now it makes sense to change the documentation to
match the functionality!

It's not entirely clear if monitor() expects this functionality.
However, with the current blocking read() semantics, it should
definitely return (and not call read()) on a poll timeout.

So, we now return the poll() result from waitReadable() (which
should have done this already probably) and check it. In the
fullness of time, we still need to revisit the whole I/O API
and make sure that it is consistent, sane, correctly documented,
and used correctly in the examples.

See #588 for more comments.

It's used by tests and isn't large.
Fixes #587

Fixes #584

This allows Jenkins to delete a sudo build.

Perhaps we should make this more algorithmic...

This enables us to test our changes for Ubuntu 15 (new gcc/c99)
before pushing upstream if desired.

Check for ovs-testcontroller in OVSController

Fixing the install.sh in INSTALL file

Update install.sh to support RedHat distrubtion

Add parameter for number of CPU cores to use in VM builds

addNAT always use first switch

Systemd's default is to mark the root mount as shared and it is
inherited as such by the new mount namespace. This means that any
mounts performed inthe new namespace will be visible by the rest of
the system, breaking privateDirs.

To restore a more sane behaviour, we explicitly mark all mounts
recursively as private, meaning that we will no longer see new mounts
from the root namespace, and our mounts will also not propagate to the
rest of the system.

Fixes #565

addNAT always use first switch even though another switch specified

fixes #513

Mininet installation will also work on RedHat distribution

Updating OpenFlow default port to 6653 (in Controller and RemoteController)

- Pass 6653 to controllers that Mininet starts
- Try to connect first on 6653 for RemoteController, then fallback to 6633

fixes #545

don't generate .pyc files on some makefile targets