Config guide workflow simplification

Config guide workflow simplification

Workflow simplification for config guide. Several good improvement
ideas taken into account. Work is not totally complete yet and may
need separate handling.
Added link to chapter "Apex installer tips" which was accidentally
dropped off.
Moved commands specific to apex to appropriate section.
Took away the Rally as an example of the test case execution behind
a proxy. Rally does not nesessarily need internet connectivity.
I finally removed the dreaded "Whiteschpace" at EOL in several
places.
Adding minor tweaks and finetuning.
Corrected the phrasing of docker installation.

JIRA: FUNCTEST-347

Change-Id: I35c094d1d89538a2991a384bbc70b48b0d18e75d
Signed-off-by: Juha Haapavirta <juha.haapavirta@nokia.com>