[configuration] allow locking service configuration version

[mikz]

by setting APICAST_SERVICE_${ID}_CONFIGURATION_VERSION environment
variable to some version it is going to be used to lock to that version

depends on #292

no ideas how to document this, ideas ? @vramosp @3scale/support @jcechace ?

[mayorova]

Just a thought – CONFIGURATION is so long, we could use CONF instead :)
But probably it's too late, as we already have a lot of other env vars using CONFIGURATION, so we probably don't want to change them all.

[mikz]

I'd rather not use abbreviations as they don't really explain it fully. It would matter in cases which you repeatedly type, but this is not that case IMO. Kind of write-once situation.

[andrewdavidmackenzie]

Is this needed for ER5? (someone asking for it?)
Or just a general improvement in the same timeframe?

[mikz]

@andrewdavidmackenzie it is linked from private Jira ticket.

And a missing feature we agreed the gateway should have before implementing the v2 configuration loading.

[octobot]

Proselint found issues

doc/parameters.md

Line	Message	Severity

Spell Checker found issues

doc/parameters.md

Line	Typo
3	APIcast v2 has a number of parameters co
3	ariables) that can modify the behavior of the gateway. The following
5	e that when deploying APIcast v2 with OpenShift, some of thee
15	Default: **stderr**
17	or more information. The file pathcan be either absolute, or relati
21	nfo
21	warn
37	Default: "apicast"
68	Values: a number > **60**
69	Default: 0
71	r. The value should be set to 0 or more than 60. For example,
71	ould be set to 0 or more than 60. For example, if `APICAST_CON
71	ONFIGURATION_CACHE` is set to 120, the gateway will reload the
71	eload the configuration every 2 minutes (120 seconds).
71	onfiguration every 2 minutes (120 seconds).
75	Default: "127.0.0.1"
77	ning Redis instance for OAuth 2.0 flow. REDIS_HOST parameter
81	Default: 6379
83	ning Redis instance for OAuth 2.0 flow. REDIS_PORT parameter
87	pty, the DNS resolver will be autodiscovered.
134	Setting it to particual version will make it not auto

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