[facts] iscsi fixes, add/fix solaris discovery for iscsi iqn

[mator]

SUMMARY

Add/fix solaris iscsi iqn discovery. Strip leading whitespace from HP-UX iscsi iqn.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

facts module

ADDITIONAL INFORMATION

There's no /etc/iscsi/initiatorname.iscsi on solaris (checked on solaris 10 and solaris 11, besides no mentions of this file in Solaris documentation), so use iscsiadm for discovery.

Before:

$ ansible -m setup solaris10 -a "filter=ansible_iscsi*"   
solaris10 | SUCCESS => {
    "ansible_facts": {
        "ansible_iscsi_iqn": "", 
        "discovered_interpreter_python": "/usr/bin/python"
    }, 
    "changed": false
}

after:

$ ansible -m setup solaris10 -a "filter=ansible_iscsi*"
solaris10 | SUCCESS => {
    "ansible_facts": {
        "ansible_iscsi_iqn": "iqn.1986-03.com.sun:01:7a8102f8ffff.50fedbb9", 
        "discovered_interpreter_python": "/usr/bin/python"
    }, 
    "changed": false
}