Uptime file not generated

[johnnykv]

The telnet and ssh sessions crashes when the attacker use the uptime command. This is because we do not yet generate (and update) /proc/uptime.

Example error from a hive session:

[james@host /]$ uptime
Traceback (most recent call last):
  File "/Users/jkv/repos/beeswarm/beeswarm/hive/capabilities/shared/shell.py", line 229, in handle
    self.COMMANDS[cmd](params)
  File "/Users/jkv/repos/beeswarm/beeswarm/hive/capabilities/shared/shell.py", line 201, in command_uptime
    with open('/proc/uptime', 'r') as f:
IOError: [Errno 2] No such file or directory: '/proc/uptime'