3PAR: Implement v2 replication (managed)

3PAR: Implement v2 replication (managed)

This patch implements the managed side of v2 replication in the HPE
3PAR driver.

Both sync and periodic replication modes are supported. Each
replication_device entry should have a replication_mode value set
to sync|periodic.

A volume type extra_spec value of replication:mode
should also be set. If replication:mode is periodic,
replication:sync_period should be set as well. Which replication_device
entry(s) are used is determined by the value of replication:mode set for
each volume type.

cinder.conf should have the replication config group (3parfcrep)
and at least one other target group (3parfc) as such:

[3parfcrep]
hpe3par_api_url = http://10.10.10.10:8008/api/v1
hpe3par_username = user
hpe3par_password = pass
hpe3par_debug = False
san_ip = 10.10.10.10
san_login = user
san_password = pass
volume_backend_name = 3parfcrep
hpe3par_cpg = REMOTE_COPY_CPG2
volume_driver = cinder.volume.drivers.hpe.hpe_3par_fc.HPE3PARFCDriver
replication_device = managed_backend_name:alex-devstack@3parfc#REMOTE_COPY_DEST2,
                     replication_mode:periodic,target_device_id:eos7,
                     cpg_map:REMOTE_COPY_CPG2:REMOTE_COPY_DEST2,
                     hpe3par_api_url:http://11.11.11.11:8008/api/v1,hpe3par_username:user,
                     hpe3par_password:pass,san_ip:11.11.11.11,san_login:user,
                     san_password:pass

[3parfc]
hpe3par_api_url = http://11.11.11.11:8008/api/v1
hpe3par_username = user
hpe3par_password = pass
hpe3par_debug = False
san_ip = 11.11.11.11
san_login = user
san_password = pass
volume_backend_name = 3parfc
hpe3par_cpg = REMOTE_COPY_DEST2
volume_driver = cinder.volume.drivers.hpe.hpe_3par_fc.HPE3PARFCDriver

Change-Id: Ie965349af719eaacc287a17c9720ad65464002c0
Implements: blueprint hp-3par-v2-replication
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