CDRIVER-2000 Skip Solaris and RHEL7.1 PPC64le

After implementing SASL_CB_CANON_USER the MongoDB on ldaptest is
replying with empty payload. Disable these until we can find out why

{
    "saslStart" : 1,
    "mechanism" : "GSSAPI",
    "payload" :
"YIICmAYJKoZIhvcSAQICAQBuggKHMIICg6ADAgEFoQMCAQ6iBwMFAAAAAACjggGTYYIBjzCCAYugAwIBBaETGxFMREFQVEVTVC4xMEdFTi5DQ6InMCWgAwIBA6EeMBwbB21vbmdvZGIbEWxkYXB0ZXN0LjEwZ2VuLmNjo4IBRDCCAUCgAwIBEqEDAgEEooIBMgSCAS7
    "autoAuthorize" : 1
}
returns:
{
    "conversationId" : 1,
    "done" : false,
    "payload" : "",
    "ok" : 1.0
}