fixes ZEN-15230: zenpack install detects if it is running in control center container

https://jira.zenoss.com/browse/ZEN-15230

DEMO:
```
# plu@plu-9: serviced service status
NAME			ID				STATUS		UPTIME			HOST	IN_SYNC		DOCKER_ID
└─Zenoss.core.full	chclmwanhzquemv0j3jrkfc2j	Stopped								
  ├─zenactiond		233r23bkckruhumwiw6um4k1e	Stopped								
  ├─Zauth		2xhcx8j8yaxtg68de0tz3uwqz	Stopped								
  ├─zeneventserver	32s2lz6mmpsc2uo8v06tn7tes	Running		2m28.812872229s		plu-9	Y		7a1b93d18538
  ├─redis		3sda7y57s71ubiqhdlp9ul01u	Running		3m2.361134956s		plu-9	Y		93c43d12184d
  ├─zeneventd		4e5vm9vjhur6k3bu5vl27s9r4	Stopped								
  ├─MetricShipper	543xdzh6gnfqdu9cegourttja	Stopped								
  ├─zenjobs		5n93prripfuhcczocq9p2uo2u	Stopped								
  ├─RabbitMQ		822e5hbjnjwvspeq6tt18l4lo	Running		2m35.668989997s		plu-9	Y		19f0bea5abce
  ├─CentralQuery	8nbq28po8peu7pwj4w60ydx56	Stopped								
  ├─MySQL		a2kgjssgk1e6wku6hu286hmki	Running		2m56.556768983s		plu-9	Y		02318b534423
  ├─Zope/0		admo64i3ao5t2299iipz4yrok/0	Running		2m41.245931885s		plu-9	Y		8ea8c021cde1
  ├─Zope/1		admo64i3ao5t2299iipz4yrok/1	Running		2m13.810006714s		plu-9	Y		3722faba1bf3
  ├─memcached		bxxsuo930rpbapcjz52ie44jg	Stopped								
  ├─localhost		c0sn5yor16ktzonva1rmrf1nv									
  │ ├─localhost		d0e5pdwi7ett49ju9jh70qj28									
  │ │ ├─zencommand	1a242e0gh0c7gcekojo10wvhu	Stopped								
  │ │ ├─zentrap		1zqjyicue3zsmsucbtnmddsua	Stopped								
  │ │ ├─collectorredis	38huruvinedmrizgs3rfe1xss	Stopped								
  │ │ ├─zenmodeler	3iarnkod8eq1m48i8xqtt476t	Stopped								
  │ │ ├─zenstatus	51x0gfhda261ft9yor5ntwaym	Stopped								
  │ │ ├─zenperfsnmp	6yzfvcrjswk7cko5c71wmlg9w	Stopped								
  │ │ ├─zenjmx		8xrrldz6q8fenbag6fny9wac1	Stopped								
  │ │ ├─zenpython	9e2pnpic662bvy1oz9l25r3oq	Stopped								
  │ │ ├─zminion		aacpu664tv23hs1ftj69qw8m8	Stopped								
  │ │ ├─zensyslog	ctnvhlmgdebfcl71uy118i6k9	Stopped								
  │ │ ├─zenping		dbwjpsmoa7q7dki4l6tedjam4	Stopped								
  │ │ ├─MetricShipper	dumw3kz8wld5dzmqd2f7dc7ir	Stopped								
  │ │ └─zenprocess	ehhvy9stysstt34c1wad4bw9f	Stopped								
  │ └─zenhub		dfagz55vo4825b70d4e2uk3ck	Stopped								
  ├─opentsdb		ctqhtb6pn9c2ttv0q562jq2lm									
  │ ├─reader		8ww3cif57ec2kddge6sox05lk	Stopped								
  │ └─writer		dyyx6j8lb5bydiknb7is06582	Stopped								
  ├─HBase		eqswzj3tz1a5co9mu43o21n77									
  │ ├─RegionServer	3y4to1nj42jpg05e1765wb2ie	Stopped								
  │ ├─ZooKeeper		5egdmp4lq2sm4qclmvs6ueo50	Stopped								
  │ └─HMaster		8b2ggtwd4oesidd72m32sorpc	Stopped								
  └─MetricConsumer	et8fen5fcbvaivemqgigwqfi2	Stopped								

# plu@plu-9: zendev devshell
I1106 10:27:27.062307 00546 server.go:341] Connected to the control center at port 10.87.110.39:4979
I1106 10:27:27.272516 00546 server.go:435] Acquiring image from the dfs...
I1106 10:27:27.273576 00546 server.go:437] Acquired!  Starting shell
Trying to connect to logstash server... 127.0.0.1:5042
Connected to logstash server.
Last login: Thu Nov  6 16:27:28 UTC 2014
(zenoss)[zenoss@056f666035f6 ~]$ zenpack --link --install /mnt/src/enterprise_zenpacks/ZenPacks.zenoss.vSphere
'module' object has no attribute 'StrictRedis'
WARNING:ZenUtils.ZopeRequestLogger:ERROR connecting to redis. redis URL: redis://localhost:6379/0
WARNING:ZenUtils.ZopeRequestLogger:Please check the redis-url value in global.conf
2014-11-06 16:28:09,398 INFO zen.ZPLoader: Loading /mnt/src/enterprise_zenpacks/ZenPacks.zenoss.vSphere/ZenPacks/zenoss/vSphere/objects/objects.xml
2014-11-06 16:28:10,342 INFO zen.AddToPack: End loading objects
2014-11-06 16:28:10,342 INFO zen.AddToPack: Processing links
2014-11-06 16:28:10,507 INFO zen.AddToPack: Loaded 174 objects into the ZODB database
2014-11-06 16:28:10,543 INFO zen.HookReportLoader: Loading reports from /mnt/src/enterprise_zenpacks/ZenPacks.zenoss.vSphere/ZenPacks/zenoss/vSphere/reports
2014-11-06 16:28:10,557 INFO zen.HookReportLoader: loading: /vSphere/Hosts
2014-11-06 16:28:10,563 INFO zen.HookReportLoader: loading: /vSphere/Datastores
2014-11-06 16:28:10,566 INFO zen.HookReportLoader: loading: /vSphere/VMs
2014-11-06 16:28:10,569 INFO zen.HookReportLoader: loading: /vSphere/VMware Utilization
2014-11-06 16:28:10,614 INFO zen.HookReportLoader: loading: /vSphere/Clusters
2014-11-06 16:28:10,617 INFO zen.HookReportLoader: loading: /Enterprise Reports/VM to Datastore
2014-11-06 16:28:31,564 INFO zen.controlplane.client: Deploying service
2014-11-06 16:28:31,837 INFO zen.vsphere: Creating vNIC catalog
2014-11-06 16:28:31,839 INFO zen.vsphere: Reindexing all vNICs
2014-11-06 16:28:32,027 INFO zen.vsphere: Creating LUN catalog
2014-11-06 16:28:32,028 INFO zen.vsphere: Reindexing all LUNs
2014-11-06 16:28:32,031 INFO zen.vsphere: Reindexing all LUNs
2014-11-06 16:28:32,033 INFO zen.vSphere: Initializing vSphere performance counter info
(zenoss)[zenoss@056f666035f6 ~]$ logout

# plu@plu-9: serviced service status vsphere
NAME			ID				STATUS		UPTIME	HOST	IN_SYNC		DOCKER_ID
└─Zenoss.core.full	chclmwanhzquemv0j3jrkfc2j	Stopped						
  └─localhost		c0sn5yor16ktzonva1rmrf1nv							
    └─localhost		d0e5pdwi7ett49ju9jh70qj28							
      └─zenvsphere	687c6yrguzmz5m6eiqxch4d5m	Stopped						

# plu@plu-9: 
```