Add DOCS, EXAMPLES, JAVA and PERL options to devel/staf

devel/staf/Makefile
Add options for DOCS, EXAMPLES, JAVA and PERL. The JAVA option
enables all JAVA-based STAF services that don't have additional
dependencies. Also add a symlink from FmtLog to fmtlog. Also update
the USE_OPENSSL syntax to USES=ssl.

PR: 210631
Submitted by: asomers, Sergey Kozlov
Reviewed by: Sergey Kozlov
Approved by: brd (ports)
Sponsored by: Spectra Logic Corp
Differential Revision: https://reviews.freebsd.org/D6910