Unified return output, added private key return output, and added missing examples across module

Couple fixes in this pull request:

1. Output returned after creating a certificate was not concise or standardized across functions.  Mainly removed the ", certificate located at" in favor of a colon.  Also private key creation output was not outputted back to the user upon creation.  Example:
<b>Output before changes when creating a CA (Notice: No private key data):</b>
```bash
prod-saltmaster.example.com:
    Created CA "saltmaster", certificate is located at "/etc/pki/saltmaster/saltmaster_ca_cert.crt"
```
<b>Output after changes when creating a CA:</b>
```bash
prod-saltmaster.example.com:
    Created Private Key: "/etc/pki/test/saltmaster/saltmaster_ca_cert.key." Created CA "saltmaster": "/etc/pki/saltmaster/saltmaster_ca_cert.crt."
```

2. Multiple fixes and added missing examples for functions:
<b>Fixing path in examples:</b>
```bash
If the following values were set::

        ca.cert_base_path='/etc/pki/koji'
        ca_name='koji'

    the resulting CA would be written in the following location::

        /etc/pki/koji/koji_ca_cert.crt
```
<b>This actually results in:</b>
```bash
prod-saltmaster.example.com:
Created Private Key: "/etc/pki/koji/koji/koji_ca_cert.key." Created CA "koji": "/etc/pki/koji/koji/koji_ca_cert.crt."
```
<b>So I modified the example and removed <i>koji</i> from <i>ca.cert_base_path</i>:</b>
```bash
If the following values were set::

        ca.cert_base_path='/etc/pki'
```
<b>Now results in expect value:</b>
```bash
prod-saltmaster.example.com:
Created Private Key: "/etc/pki/koji/koji_ca_cert.key." Created CA "koji": "/etc/pki/koji/koji_ca_cert.crt."
```

~Rob