inconsistent parameter list in get_hostname method for subclasses of sources.DataSource

This bug was originally filed in Launchpad as [LP: #1413788](https://bugs.launchpad.net/cloud-init/+bug/1413788)

Launchpad details

affected_projects = []

assignee = None

assignee_name = None

date_closed = None

date_created = 2015-01-22T22:56:42.968307+00:00

date_fix_committed = None

date_fix_released = None

id = 1413788

importance = undecided

is_complete = False

lp_url = https://bugs.launchpad.net/cloud-init/+bug/1413788

milestone = None

owner = mmorais

owner_name = Marco Morais

private = False

status = confirmed

submitter = mmorais

submitter_name = Marco Morais

tags = []

duplicates = []

_Launchpad user **Marco Morais(mmorais)** wrote on 2015-01-22T22:56:42.968307+00:00_

The sources.DataSource class has method defined as:
def get_hostname(self, fqdn=False, resolve_ip=False)

The parameter list in the following subclasses of sources.DataSource is not consistent with this method (see [1] for details):
DataSourceDigitalOcean
DataSourceGCE

[1]
$ find cloudinit/sources/ -type f | xargs grep 'def get_hostname'
cloudinit/sources//init.py: def get_hostname(self, fqdn=False, resolve_ip=False):
cloudinit/sources//DataSourceCloudSigma.py: def get_hostname(self, fqdn=False, resolve_ip=False):
cloudinit/sources//DataSourceDigitalOcean.py: def get_hostname(self, fqdn=False):
cloudinit/sources//DataSourceGCE.py: def get_hostname(self, fqdn=False, _resolve_ip=False):
cloudinit/sources//DataSourceOpenNebula.py: def get_hostname(self, fqdn=False, resolve_ip=None):