Increase heartbeat timeout since LXC isolation module's execs can take 10s to time out.
Increase heartbeat timeout since LXC isolation module's execs can take
10s to time out.

benh/twesos,charlescearl/VirtualMesos,benh/twesos,benh/twesos,benh/twesos,charlescearl/VirtualMesos,benh/twesos,benh/twesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos,benh/twesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos,benh/twesos,benh/twesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos