Migrating XTRA from gpsonextra.net to cloud based izatcloud.net

*Added logic to remove xtra1.gpsonextra.net from URLs
received from modem.
*Added logic to override modem URLs with those configured
in gps.conf
*Replaced all instances of xtra{1,2,3}.gpsonextra.net domain URLs
in gps.conf with xtrapath{1,2,3}.izatcloud.net URLs.
*Replaced all commented instances of xtra.bin in gps.conf with xtra2.bin.

CRs-fixed: 643816

Change-Id: I803b26bce22f06910dcaa1ee057902b9381667bf

Conflicts:
	gps/etc/gps.conf
Remove reduntant clearing of GpsLocation memory

GpsLocation memory will now be cleared inside the
Loc Api handler itself, so no need to do it a second
time before calling into the Loc Api handler.

Change-Id: Iec37624621d6eb4806eb8e13c807bb4e40584e39
CRs-fixed: 726800