security/kpcli: update to 2.8 and add run dependencies for optional clipboard support

[sbz]

Summary

kpcli requires p5-Clipboard and p5-Capture-Tiny in order to use the x* commands
in the shell to benefit of the optionnal clipboard features

Test Plan

Before:
kpcli -kdb your.kdb

show n
xp n

Error: xp requires the Clipboard and Capture::Tiny modules:

• http://search.cpan.org/~king/Clipboard/
• http://search.cpan.org/~dagolden/Capture-Tiny/

After (with patch):

xp n

Copied password for "n" to the clipboard.

[sbz]

remove devel/py-ptrace diff

[sbz]

while I'm here update it to last 2.8 version