Improve logging for Jetpack REST migrations

[koke]

As part of #3627 this improves logging so we can support Jetpack sites better:

• It will log when a new site is added automatically via syncBlogs
• It will log when a Jetpack site is migrated to use REST
• Improves the blog list logged on launch

Some sample blogs and their logged description on launch

Before

Name: Edge test site URL: http://edge.wpmt.co XML-RPC: http://edge.wpmt.co/xmlrpc.php isWpCom: NO blogId: 0 jetpackAccount: PRESENT
Name: Jetpack Test #2 URL: http://jp2.koke.co XML-RPC: http://jp2.koke.co/xmlrpc.php isWpCom: NO blogId: 0 jetpackAccount: NONE
Name: Jorge Bernal URL: http://jorgebernal.es XML-RPC: https://jorgebernales.wordpress.com/xmlrpc.php isWpCom: YES blogId: 17691640 jetpackAccount: NONE
Name: Jorge Bernal URL: http://jorgebernal.info XML-RPC: https://jorgebernalen.wordpress.com/xmlrpc.php isWpCom: YES blogId: 17758711 jetpackAccount: NONE
Name: Koke's Journal URL: http://koke.me XML-RPC: https://kokejournal.wordpress.com/xmlrpc.php isWpCom: YES blogId: 16764956 jetpackAccount: NONE
Name: Test site URL: http://test.koke.co XML-RPC: http://test.koke.co/xmlrpc.php isWpCom: YES blogId: 63902892 jetpackAccount: NONE
Name: WordPress Latest URL: http://wp.koke.me XML-RPC: http://wp.koke.me/xmlrpc.php isWpCom: NO blogId: 0 jetpackAccount: NONE
Name: WordPress Secure URL: http://wps.koke.me XML-RPC: https://wps.koke.me/xmlrpc.php isWpCom: YES blogId: 91395574 jetpackAccount: NONE
Name: WordPress Trunk URL: http://wpt.koke.me XML-RPC: http://wpt.koke.me/xmlrpc.php isWpCom: NO blogId: 0 jetpackAccount: NONE

After

<Blog Name: Edge test site URL: http://edge.wpmt.co XML-RPC: http://edge.wpmt.co/xmlrpc.php jetpack: 🚀🚀 Jetpack 3.5.3 fully connected as wpmtestjp with site ID 59803729
<Blog Name: Jetpack Test #2 URL: http://jp2.koke.co XML-RPC: http://jp2.koke.co/xmlrpc.php jetpack: 🚀❌ Jetpack 3.5.3 not connected
<Blog Name: Jorge Bernal URL: http://jorgebernal.es XML-RPC: https://jorgebernales.wordpress.com/xmlrpc.php wp.com account: kokeme blogId: 17691640
<Blog Name: Jorge Bernal URL: http://jorgebernal.info XML-RPC: https://jorgebernalen.wordpress.com/xmlrpc.php wp.com account: kokeme blogId: 17758711
<Blog Name: Koke's Journal URL: http://koke.me XML-RPC: https://kokejournal.wordpress.com/xmlrpc.php wp.com account: kokeme blogId: 16764956
<Blog Name: Test site URL: http://test.koke.co XML-RPC: http://test.koke.co/xmlrpc.php wp.com account: kokeme blogId: 63902892
<Blog Name: WordPress Latest URL: http://wp.koke.me XML-RPC: http://wp.koke.me/xmlrpc.php jetpack: 🚀❔Jetpack not installed
<Blog Name: WordPress Secure URL: http://wps.koke.me XML-RPC: https://wps.koke.me/xmlrpc.php wp.com account: kokeme blogId: 91395574
<Blog Name: WordPress Trunk URL: http://wpt.koke.me XML-RPC: http://wpt.koke.me/xmlrpc.php jetpack: 🚀✅ Jetpack 3.5.3 connected as UNKNOWN with site ID 22793269

Needs Review: @sendhil

[sendhil]

Cute use of emoji ;)

[sendhil]

Looks good to me.