configuration files must not be required for build

[loomis]

Currently, two configuration files are required to build the SlipStream software. This is wrong; the build must not depend on outside configuration.

The following is the text from the contributors guide concerning these files:

$ touch /usr/bin/slipstream.client.conf

$ cat > ~/slipstream.context << EOF
[contextualization]
diid = 123
cookie = foo
serviceurl = http://example.com
node_instance_name = instance-name
EOF

[loomis]

The slipstream.context file no longer appears to be needed for the build.

[konstan]

slipstream.context is still need for the build. Opened #282