sysutils/cfengine3283.28.0_1

databases/lmdb: allow to install both 0.x and 1.x together

LMDB 1.0 and the legacy 0.9 ABI cannot be mixed, the datanase format are
incompatibles as well.

Rename or relocate everything databases/lmdb0 installs so that it no
longer overlaps with databases/lmdb:
- the utilities are now mdb_copy0, mdb_dump0, mdb_load0 and mdb_stat0
- the header is include/lmdb0/lmdb.h
- the linker name is liblmdb0.so, the shared object keeps its ABI name
  liblmdb.so.0 so already linked programs are unaffected
- the pkg-config file is lmdb0.pc

A compatibility prefix holding the previous layout is also installed
under ${PREFIX}/lmdb0/ (include/, lib/ and libdata/pkgconfig/) so that
build systems which expect to find lmdb.h and -llmdb relative to a
single directory only need a path change.

Now all ports should migrate to lmdb 1.X and use the lmdb 0.9 port to ease
in the migration path, lmdb, the lmdb 0.x is supposed to get removed at
some point.

Approved by:	mat (portmgr)
Reviewed by:	mat
Differential Revision:	https://reviews.freebsd.org/D60741

*: cleanup fetching

sysutils/cfengine328: Add new port

Add the latest cfengine to the ports collection.

Update the sysutils/cfengine metaport to point to the new port. It
becomes default.