NIST: increase RSA key length to 2048 bit

According to NIST 800-131A, RSA key lenght for digital signature
must >= 2048 bit. Now we use 1024 bit key to generate x509 cert
file. Need to increase the key length to 2048 bit.

Change-Id: I59f614b5d8a79f9e0a96503867cfca176be5c757
Closes-Bug: 1369487
Add unit test for glanceclient ssl options

Commit 0fe6997856ae39afcbed0ad53cc2916ec369c9d5 added code to pass ssl
options when creating the glance client but was missing a unit test.

Related-Bug: #1279381

Change-Id: Iaf1b8e59d98382c630b8e4e13234b9028a873482
Merge "NIST: increase RSA key length to 2048 bit"
Merge "Add unit test for glanceclient ssl options"