added ChangeLog.git to show changes since 2.5.1
[server] fixed copy-and-paste NULL check bug found by Coverity
[server] better checking for read() return value flagged by Coverity
added Coverity finds/fixes to ChangeLog.git for 2.6.0
updated fwknop.spec file release note for 2.6.0
added fwknop.spec update to ChangeLog.git