Revert "tools/biolatency: Handle signals from user"
Revert "tools/biolatency: Handle signals from user"

This reverts commit 87792ce6b783941ea1d8bcd29812a55520930c95.

Let us have a consensus about how bcc tools should interact with
external signals etc. before applying such changes to this tool
and other tools.

brendangregg/bcc,iovisor/bcc,brendangregg/bcc,iovisor/bcc,brendangregg/bcc,brendangregg/bcc,brendangregg/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc