Merge pull request #11797 from crh0716/907486

Bug 907486 - Check network connectivity before using network mcc and mnc of mozMobileConnection r=evelyn a=leo+(cherry picked from commit add1490528875e321349755fd888baa451190385)

Conflicts:
	shared/js/tz_select.js
Merge branch 'v1-train' into v1.1.0hd