test: Allow more journal messages during restart.

And refactor the code.
test: check-networking for Fedora 21

Avoid racing against NM after hotplugging by waiting for it to
activate the new interface.
test: check-journal for Fedora 21

Log in as root...
test: Disable check-storage testDosParts

And don't use extended partitions in other tests.

See https://bugzilla.redhat.com/show_bug.cgi?id=1135493
test: Put new location of magic base tarballs into README.
test: Don't let ipa-server-install block on /dev/random.
test: Allow specification of vlan when adding network interface to a VM.
test: Don't bridge two interfaces on the same network.

This ends in tears without STP enabled.
test: Update README for Fedora 21 support.
test: Fix selinux context of test-server

Use /usr/bin/runcon to set it as unconfined. The way to do this
has changed between Fedora 20 and Fedora 21.