*/*: Fix conflict of PKGNAME

• Fix conflict of PKGNAME by adding PKGNAMESUFFIX to the ports below
  • databases/tdb1410
  • devel/talloc242
  • devel/tevent016
• Set CONFLICTS_INSTALL between different versions of each port.
• Update dependencies of databases/ldb29 and net/samba420 to reflect change of PKGNAME.
• Bump PORTREVISION of modified ports.

Reviewed by: 0mp, kiwi
Differential Revision: https://reviews.freebsd.org/D48826