Test for the existence of /var/run/jenkins before trying to chown it in
the Debian post-install script.

Ensures that the directory /var/run/jenkins exists before the installer
script attempts to chmod it.

Hold on to the lease until the very end.
Previously, the lease was only held until the main build section is over, before publishers start running.

Reproduced the problem. Workspace is getting released prematurely, before publishers run. This has all sorts of serious problems.

This changes the hard-coded display name in the breadrumb bar to match
the localized message used in Configure Global Security/Access Control

[FIXED JENKINS-14380] hudson appears in a the webpage title

provide localization for HudsonHomeDiskUsageMonitor.getDisplayName()

May not suffice: a fatal error may simply be thrown later on.

[JENKINS-15757] Ignore 'remember me' if disabled in configuration

A new test for the existing 'Remember me' functionality that verifies that
the cookie is set, and a new test showing that, even if requested by the
user, no cookie will be set, if 'Remember me' is disabled in the security
configuration.

"Jenkins is loading" page gets set up before Jenkins instance gets
initialized.

these messages were purged in 772bd8f6
for being unused, but they are actually active.

[FIXED JENKINS-20191] Add Test button to check proxy connection