Set apache ServerName, reboot, restart devstack

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Add logging calls to each helper function

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Tweaks to is_online and reconnect()

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Actually call Remote.reconnect()

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Make rejoin-stack.sh start screen in detached mode

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Move restart_apache() to after the reboot

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Simplify create_if_vm's downburst config logic

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Add note about memory requirements

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Add documentation to reboot()

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Move reboot() to teuthology.misc

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Make reconnect() use Remote.reconnect()

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>