Trim CLI imports of whitespace please

[mattbishop]

I was setting up a new configuration and had copy-pasted the URL from another document. I inadvertently copied a space as the beginning of the text (like https://...) and kept getting an error:

error storing password in keychain: parse " https://sso.jumpcloud.com/saml2/awsep-98082epcc-btc-non": first path segment in URL cannot contain colon

I eventually figured out it was the whitespace and fixed up the URL to be correct without the space.

However, it would be been helpful if saml2aws did the trimming on all CLI keyboard input. Pretty common mistake.