Pass Parameters at Jail creation time

[fabianfreyer]

See #1.

Based on Work by @Joppich.

[fabianfreyer]

This brings down the jail startup time by around 20%:
before:

test start_stop_ipjail          ... bench:      52,498 ns/iter (+/- 714)
test start_stop_ipv4jail        ... bench:      51,678 ns/iter (+/- 1,488)
test start_stop_ipv6jail        ... bench:      52,260 ns/iter (+/- 548)
test start_stop_jail            ... bench:      50,832 ns/iter (+/- 462)

after:

test start_stop_ipjail          ... bench:      39,718 ns/iter (+/- 10,643)
test start_stop_ipv4jail        ... bench:      39,012 ns/iter (+/- 1,429)
test start_stop_ipv6jail        ... bench:      39,336 ns/iter (+/- 1,375)
test start_stop_jail            ... bench:      38,433 ns/iter (+/- 1,524)