Do not use hugepages if none are available.
Do not use hugepages if none are available.

In case socket-mem was set to <1024 and no 1G page long hupepages were
available, the condition was evaluated in unexpected manner. In other
words use_1g == 1, and that fails later in mount().
This patch makes sure this is prevented - if there are no pages_available,
do not even try to use that pagesize.

Change-Id: I30675aa017d97b99d84d5db926e62f0acb54deb6
Signed-off-by: Stefan Kobza <af3f24072d8849729f5b58299f26344aacced2fe@cisco.com>

milanlenco/vpp,milanlenco/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,milanlenco/vpp,FDio/vpp,GabrielGanne/vpp-flowtable,vpp-dev/vpp,chrisy/vpp,milanlenco/vpp,FDio/vpp,vpp-dev/vpp,milanlenco/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,GabrielGanne/vpp-flowtable,GabrielGanne/vpp-flowtable,muharif/vpp,muharif/vpp,vpp-dev/vpp,muharif/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp,GabrielGanne/vpp-flowtable,vpp-dev/vpp,GabrielGanne/vpp-flowtable,FDio/vpp,muharif/vpp,muharif/vpp,GabrielGanne/vpp-flowtable,chrisy/vpp,chrisy/vpp,muharif/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,milanlenco/vpp,FDio/vpp