repoman: Fix unsafe string interpolation.

"on line: %d" etc. is no longer included in messages returned from individual checks.
"line %d: " is now consistently added by controller directly after ebuild path
and precedes specific message.

Example:
   app-misc/test/test-0.ebuild: line 5: please migrate from 'games' (no replacement)
   app-misc/test/test-0.ebuild: line 5: please migrate from 'versionator' to 'eapi7-ver (built-in since EAPI 7)'
   app-misc/test/test-0.ebuild: line 10: Useless blank line
   app-misc/test/test-0.ebuild: line 20: 'econf' call should be moved to src_configure

Bug: https://bugs.gentoo.org/699508
Signed-off-by: Arfrever Frehtes Taifersar Arahesis <Arfrever@Apache.Org>
Signed-off-by: Zac Medico <zmedico@gentoo.org>
12 files changed