bugfix: imtcp flowControl parameter incorrectly defaulted to "off"

This could cause message loss on systems under heavy load and was
a change-of-behaviour to previous version. This is a regression
most probably introduced in 5.9.0 (but did not try hard to find the
exact point of its introduction).
Merge branch 'v7-stable'
bugfix: potential abort during HUP

This could happen when one of imklog, imzmq3, imkmsg, impstats,
imjournal, or imuxsock were under heavy load during a HUP.
closes: http://bugzilla.adiscon.com/show_bug.cgi?id=489
Thanks to Guy Rozendorn for reporting the problem and Peval Levhshin for
his analysis.
remove memleak introduced by GenerateLocalHostName HUP bugfix
Merge branch 'v7-stable'
refactor: simplify localHostName property handling
Merge branch 'master' into master-ruleeng