Patches UA and PROXY in metsrv when running migrate
msftidy'd
De-committing based on suggestions from Meatballs1 and jlee-r7.
Provides methods to patch metsrv stagers with options.
Cleaned up indents.
Refactored expiration and timeout logic in client_core.rb
Mitigates excessive use of lookup operator (hopefully adds clarity)
Uses a hash for options as opposed to numerous methods on blob
Reworked to avoid extending String class on blob per hdm's rec.
Refactors metsrv patching in reverse_http.rb
Refactors metsrv patching in reverse_hop_htt.rb
Patch UA/Proxy settings during migration, lands #3632