- Removed functions from zone-contents - no need for them to be public.

- Mimics BIND

Two reasons:
- There's some rare race condition in the queue implementation
- Doesn't scale and current performance is almost the same (-~2%)
- Created branch with the queue still retained for future inspection

This should be properly solved by better zone fetching API with
a) refcounting b) locking.

refs #31
fixes #30

- Added a simple list to check already inserted CNAMEs
- Removed obsolote checking functions
- Nightly test will fail, because CNAME loops will be loaded and xfr-in'd

(changes in scanner intentionally skipped)

Change-Id: Ic1b60bec6b85209040d4a270e45aa3f6e8f64e51

Change-Id: Ib10e0b882757c1fa3981dea20f29bf7179e4a2a5

This was wrong for cases like NSEC3 where no common suffix, like
the apex, is not in zone. Since the nodes are linked in circular
fashion, the easy solution is to find leftmost node and take it's
predecesor, which should be the rightmost node.

Change-Id: I5fa3714a889f159c682b255aeeef7d466f8be2ce

Signed could result to overflow in label length.

Change-Id: Ic1cae2c0df295127940fe1af74561690c0cddc30

Change-Id: I370ec936172d0d3a3422417010de6166810bcb72

7-bit ASCII is not enough to cover corner cases and potentially
harmful qnames.

Change-Id: I83a5af63e7ab3d2ce87c7b5063e55f1a1a6c2e1e

Change-Id: I8b934ca1f9cd0b80f7e1ede479674c269415f2da

Change-Id: I5806deddafc63906c2dd62e06342ab16ef0eb6a9

Change-Id: Ic122d9fb46c97946bb35fd83f4fae9e810257e5d

Change-Id: I7583fae53feb3daa8dd790a97b6ae158870e7b5e

Change-Id: I904cf4ea0a99652f2a2370fde17af770b1273dc4

Change-Id: I2532a02610b91fd11d162136fda3ac2322d45766

Change-Id: I882697e314d3f3ef731ef531f3ea7462640606e7

Change-Id: I12e5a43c71243b0774d049b25973d34ae41b6078

and use absolute path in build directory for zscanner tests.

Change-Id: I75b6d02b93d28cc9ff1354d5432d10b20cf734b5

Change-Id: Ibb5c289cbd04a3affb57dcf31d3d7bcf6b4b79b0

refs #2388

Change-Id: Ib4b047618d84a3e0e38e809fcef748bff21fa5cc

Change-Id: I12f71e203183a84e883b5cd26f31fd5bac8fb2d2

refs #2388

Change-Id: Ic37c74e22356dd4f9354cd45a3f216c4e345200b