[TASK] Output actual exception message for failed core migrations
[TASK] Output actual exception message for failed core migrations

Exceptions that are thrown during application of core migrations are
caught in the ``Migrations\Manager`` masking the actual error message.

This change adds the actual exception message to the re-thrown
RuntimeException.

Change-Id: Iad2cc5a20b73a495d826fb3ddae7ec5058c05e6d
Related: FLOW-179
Releases: master, 3.0
Original-Commit-Hash: 095ba033cae5cef15765911df77dd609b652fdfe

dlubitz/flow-development-collection,gerhard-boden/flow-development-collection,albe/flow-development-collection,kdambekalns/flow-development-collection,bwaidelich/flow-development-collection,neos/flow-development-collection,kitsunet/flow-development-collection,mkeitsch/flow-development-collection,fcool/flow-development-collection,fcool/flow-development-collection,bwaidelich/flow-development-collection,dfeyer/flow-development-collection,robertlemke/flow-development-collection,dlubitz/flow-development-collection,chewbakartik/flow-development-collection,chewbakartik/flow-development-collection,dfeyer/flow-development-collection,daniellienert/flow-development-collection,robertlemke/flow-development-collection,kitsunet/flow-development-collection,chewbakartik/flow-development-collection,bwaidelich/flow-development-collection,aertmann/flow-development-collection,kdambekalns/flow-development-collection,gerhard-boden/flow-development-collection,albe/flow-development-collection,daniellienert/flow-development-collection,gerhard-boden/flow-development-collection,mkeitsch/flow-development-collection,daniellienert/flow-development-collection,kitsunet/flow-development-collection,kdambekalns/flow-development-collection,dfeyer/flow-development-collection,robertlemke/flow-development-collection,fcool/flow-development-collection,neos/flow-development-collection,neos/flow-development-collection,aertmann/flow-development-collection,dlubitz/flow-development-collection,albe/flow-development-collection,robertlemke/flow-development-collection,aertmann/flow-development-collection,kdambekalns/flow-development-collection,fcool/flow-development-collection,mkeitsch/flow-development-collection,neos/flow-development-collection,dfeyer/flow-development-collection