Update host/ip pairing rather than add the hostname a second time
Added replace kwarg whether to first remove any existing hostnames that match
Avoid running qemu-img when hypervisor is specified as esxi.

This is shown in the logs before this patch:

```
qemu-img: Could not open '[0] vm1/vm1.vmdk': No such file or directory
```

And the result from running virt.get_disks vm1 was before this patch:

```
build04:
    ----------
    sda:
        ----------
        file:
            [0] vm1/vm1.vmdk
        image:
            Does not exist
```

After the patch is applied:

```
build04:
    ----------
    sda:
        ----------
        file:
            [0] vm1/vm1.vmdk
```
Remove print()
Unify name: emulator vs hypervisor
Adding hash compare of files in RemoteClient.get_file().

 Adding hash compare of file in RemoteClient.get_file(). Avoid downloading if file hasn't changed between local cache and on remote server.
 This doesn't eliminate number of salt calls from minion to master and no great speed up when master and minions are in the same LAN. However it may help, minions over Internet and with slow links.
Clarify and make connection settings more flexible for libvirt

Previously you could specify a hostname or IP in the minion configuration. It was not flexible enough. Now you can either specify an explicit libvirt URI, or a libvirt connection alias.

Note: this is an incompatible change to #6672 when it comes to the configuration. The connection string can no longer contain a hostname.

 - http://libvirt.org/drvesx.html#uriformat
 - http://libvirt.org/uri.html#URI_config
Merge branch 'develop' into esxi
KVM and qemu both use qemu-img
Run the CLI tools as the configured user
Add a parser option for `retcode_passthrough`.
Added gitfs_root option
Since salt-call can run as any user, no privileges dropping should be done for it.
Merge pull request #6767 from terminalmage/docs

Audit module documentation (E to K)
Merge pull request #6765 from gatoralli/develop

Added gitfs_root option
Merge pull request #6761 from s0undt3ch/features/cli-retcode-passthrough

Add a parser option for `retcode_passthrough`.
Merge pull request #6760 from s0undt3ch/hotfix/drop-privileges

Run the CLI tools as the configured user
Merge pull request #6740 from holmboe/esxi

Changes to virt.py for ESXi support
Merge pull request #6683 from kevinastone/develop

Update host/ip pairing rather than add the hostname a second time
Revert "Added replace kwarg whether to first remove any existing hostnames that match"

This reverts commit 5cb4f1ed5a6ac7f2efd6235363a576a96f317f67.